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<h2 id="history">History</h2> <p>The use of animals in research dates back to <a href="/facts/Ancient_Greece/PTVBrWXq">ancient Greece</a>, with <a href="/facts/Aristotle/U2bDlBFW">Aristotle</a> (384–322 BCE) and <a href="/facts/Erasistratus/vPTRRmGJ">Erasistratus</a> (304–258 BCE) among the first to perform experiments on living animals.<a class="footnote-ref" id="fnref:48" href="#fn:48"><sup>48</sup></a> Discoveries in the 18th and 19th centuries included <a href="/facts/Antoine_Lavoisier/UheVQrhu">Antoine Lavoisier</a>'s use of a <a href="/facts/Guinea_pig/gRXC2qNN">guinea pig</a> in a <a href="/facts/Calorimeter/Njp46oI8">calorimeter</a> to prove that <a href="/facts/Respiration_(physiology)/KKWAJIbd">respiration</a> was a form of combustion, and <a href="/facts/Louis_Pasteur/lboGfpy0">Louis Pasteur</a>'s demonstration of the <a href="/facts/Germ_theory_of_disease/VReJjyw7">germ theory of disease</a> in the 1880s using <a href="/facts/Anthrax/svk0t5G4">anthrax</a> in sheep.<a class="footnote-ref" id="fnref:49" href="#fn:49"><sup>49</sup></a> </p><p>Research using animal models has been central to most of the achievements of modern medicine.<a class="footnote-ref" id="fnref:50" href="#fn:50"><sup>50</sup></a><a class="footnote-ref" id="fnref:51" href="#fn:51"><sup>51</sup></a><a class="footnote-ref" id="fnref:52" href="#fn:52"><sup>52</sup></a> It has contributed most of the basic knowledge in fields such as human <a href="/facts/Physiology/fh25y2pQ">physiology</a> and <a href="/facts/Biochemistry/fa2pWEBp">biochemistry</a>, and has played significant roles in fields such as <a href="/facts/Neuroscience/o5RV8Cas">neuroscience</a> and <a href="/facts/Infectious_disease/182XrncP">infectious disease</a>.<a class="footnote-ref" id="fnref:53" href="#fn:53"><sup>53</sup></a><a class="footnote-ref" id="fnref:54" href="#fn:54"><sup>54</sup></a> For example, the results have included the near-<a href="/facts/Poliomyelitis_eradication/GfAeHrse">eradication of polio</a> and the development of <a href="/facts/Organ_transplantation/1jNvVJn6">organ transplantation</a>, and have benefited both humans and animals.<a class="footnote-ref" id="fnref:55" href="#fn:55"><sup>55</sup></a><a class="footnote-ref" id="fnref:56" href="#fn:56"><sup>56</sup></a> From 1910 to 1927, <a href="/facts/Thomas_Hunt_Morgan/4wswVmWC">Thomas Hunt Morgan</a>'s work with the fruit fly <i><a href="/facts/Drosophila_melanogaster/KtnHVCcB">Drosophila melanogaster</a></i> identified <a href="/facts/Chromosome/FRGf11FC">chromosomes</a> as the vector of inheritance for genes.<a class="footnote-ref" id="fnref:57" href="#fn:57"><sup>57</sup></a><a class="footnote-ref" id="fnref:58" href="#fn:58"><sup>58</sup></a> <i>Drosophila</i> became one of the first, and for some time the most widely used, model organisms,<a class="footnote-ref" id="fnref:59" href="#fn:59"><sup>59</sup></a> and <a href="/facts/Eric_Kandel/GD1pRcNN">Eric Kandel</a> wrote that Morgan's discoveries "helped transform biology into an experimental science".<a class="footnote-ref" id="fnref:60" href="#fn:60"><sup>60</sup></a> <i>D. melanogaster</i> remains one of the most widely used eukaryotic model organisms. During the same time period, studies on mouse genetics in the laboratory of <a href="/facts/William_Ernest_Castle/WMNlU4up">William Ernest Castle</a> in collaboration with <a href="/facts/Abbie_Lathrop/1h5oFWXF">Abbie Lathrop</a> led to generation of the DBA ("dilute, brown and non-agouti") inbred mouse strain and the systematic generation of other inbred strains.<a class="footnote-ref" id="fnref:61" href="#fn:61"><sup>61</sup></a><a class="footnote-ref" id="fnref:62" href="#fn:62"><sup>62</sup></a> The mouse has since been used extensively as a model organism and is associated with many important biological discoveries of the 20th and 21st centuries.<a class="footnote-ref" id="fnref:63" href="#fn:63"><sup>63</sup></a> </p><p>In the late 19th century, <a href="/facts/Emil_von_Behring/bk06nMKy">Emil von Behring</a> isolated the <a href="/facts/Diphtheria/IKFXNjAV">diphtheria</a> toxin and demonstrated its effects in guinea pigs. He went on to develop an antitoxin against diphtheria in animals and then in humans, which resulted in the modern methods of immunization and largely ended diphtheria as a threatening disease.<a class="footnote-ref" id="fnref:64" href="#fn:64"><sup>64</sup></a> The diphtheria antitoxin is famously commemorated in the Iditarod race, which is modeled after the delivery of antitoxin in the <a href="/facts/1925_serum_run_to_Nome/aVtNFzxe">1925 serum run to Nome</a>. The success of animal studies in producing the diphtheria antitoxin has also been attributed as a cause for the decline of the early 20th-century opposition to animal research in the United States.<a class="footnote-ref" id="fnref:65" href="#fn:65"><sup>65</sup></a> </p><p>Subsequent research in model organisms led to further medical advances, such as <a href="/facts/Frederick_Banting/gTqf4aEJ">Frederick Banting</a>'s research in dogs, which determined that the isolates of pancreatic secretion could be used to treat dogs with <a href="/facts/Diabetes_mellitus/2xeHXbsI">diabetes</a>. This led to the 1922 discovery of <a href="/facts/Insulin/oXG0myt1">insulin</a> (with <a href="/facts/John_Macleod_(physiologist)/pYfQxcp4">John Macleod</a>)<a class="footnote-ref" id="fnref:66" href="#fn:66"><sup>66</sup></a> and its use in treating diabetes, which had previously meant death.<a class="footnote-ref" id="fnref:67" href="#fn:67"><sup>67</sup></a> <a href="/facts/John_Cade/xu7vj1e4">John Cade</a>'s research in guinea pigs discovered the anticonvulsant properties of lithium salts,<a class="footnote-ref" id="fnref:68" href="#fn:68"><sup>68</sup></a> which revolutionized the treatment of <a href="/facts/Bipolar_disorder/aMDwXbV0">bipolar disorder</a>, replacing the previous treatments of lobotomy or electroconvulsive therapy. Modern general anaesthetics, such as <a href="/facts/Halothane/PQ58E6ah">halothane</a> and related compounds, were also developed through studies on model organisms, and are necessary for modern, complex surgical operations.<a class="footnote-ref" id="fnref:69" href="#fn:69"><sup>69</sup></a><a class="footnote-ref" id="fnref:70" href="#fn:70"><sup>70</sup></a> </p><p>In the 1940s, <a href="/facts/Jonas_Salk/1dkedaHa">Jonas Salk</a> used rhesus monkey studies to isolate the most virulent forms of the <a href="/facts/Polio/6dYyXUhE">polio</a> virus,<a class="footnote-ref" id="fnref:71" href="#fn:71"><sup>71</sup></a> which led to his creation of a <a href="/facts/Polio_vaccine/nR2Tk2Um">polio vaccine</a>. The vaccine, which was made publicly available in 1955, reduced the incidence of polio 15-fold in the United States over the following five years.<a class="footnote-ref" id="fnref:72" href="#fn:72"><sup>72</sup></a> <a href="/facts/Albert_Sabin/QWR9F1r3">Albert Sabin</a> improved the vaccine by passing the polio virus through animal hosts, including monkeys; the Sabin vaccine was produced for mass consumption in 1963, and had virtually eradicated polio in the United States by 1965.<a class="footnote-ref" id="fnref:73" href="#fn:73"><sup>73</sup></a> It has been estimated that developing and producing the vaccines required the use of 100,000 rhesus monkeys, with 65 doses of vaccine produced from each monkey. Sabin wrote in 1992, "Without the use of animals and human beings, it would have been impossible to acquire the important knowledge needed to prevent much suffering and premature death not only among humans, but also among animals."<a class="footnote-ref" id="fnref:74" href="#fn:74"><sup>74</sup></a> </p><p>Other 20th-century medical advances and treatments that relied on research performed in animals include <a href="/facts/Organ_transplant/1jNvVJn6">organ transplant</a> techniques,<a class="footnote-ref" id="fnref:75" href="#fn:75"><sup>75</sup></a><a class="footnote-ref" id="fnref:76" href="#fn:76"><sup>76</sup></a><a class="footnote-ref" id="fnref:77" href="#fn:77"><sup>77</sup></a><a class="footnote-ref" id="fnref:78" href="#fn:78"><sup>78</sup></a> the heart-lung machine,<a class="footnote-ref" id="fnref:79" href="#fn:79"><sup>79</sup></a> <a href="/facts/Antibiotic/sF1kIfxg">antibiotics</a>,<a class="footnote-ref" id="fnref:80" href="#fn:80"><sup>80</sup></a><a class="footnote-ref" id="fnref:81" href="#fn:81"><sup>81</sup></a><a class="footnote-ref" id="fnref:82" href="#fn:82"><sup>82</sup></a> and the <a href="/facts/Whooping_cough/LyrTdSeh">whooping cough</a> vaccine.<a class="footnote-ref" id="fnref:83" href="#fn:83"><sup>83</sup></a> Treatments for animal diseases have also been developed, including for <a href="/facts/Rabies/rPDyNHwL">rabies</a>,<a class="footnote-ref" id="fnref:84" href="#fn:84"><sup>84</sup></a> <a href="/facts/Anthrax/svk0t5G4">anthrax</a>,<a class="footnote-ref" id="fnref:85" href="#fn:85"><sup>85</sup></a> <a href="/facts/Glanders/pq1yVTJu">glanders</a>,<a class="footnote-ref" id="fnref:86" href="#fn:86"><sup>86</sup></a> <a href="/facts/Feline_immunodeficiency_virus/dYKMBf1V">feline immunodeficiency virus</a> (FIV),<a class="footnote-ref" id="fnref:87" href="#fn:87"><sup>87</sup></a> <a href="/facts/Tuberculosis/ggPyovAl">tuberculosis</a>,<a class="footnote-ref" id="fnref:88" href="#fn:88"><sup>88</sup></a> Texas cattle fever,<a class="footnote-ref" id="fnref:89" href="#fn:89"><sup>89</sup></a> <a href="/facts/Classical_swine_fever/NdhSFvtR">classical swine fever</a> (hog cholera),<a class="footnote-ref" id="fnref:90" href="#fn:90"><sup>90</sup></a> <a href="/facts/Heartworm/JXqtg1N9">heartworm</a>, and other <a href="/facts/Parasitic_disease/DU94HYrL">parasitic infections</a>.<a class="footnote-ref" id="fnref:91" href="#fn:91"><sup>91</sup></a> Animal experimentation continues to be required for biomedical research,<a class="footnote-ref" id="fnref:92" href="#fn:92"><sup>92</sup></a> and is used with the aim of solving medical problems such as Alzheimer's disease,<a class="footnote-ref" id="fnref:93" href="#fn:93"><sup>93</sup></a> AIDS,<a class="footnote-ref" id="fnref:94" href="#fn:94"><sup>94</sup></a><a class="footnote-ref" id="fnref:95" href="#fn:95"><sup>95</sup></a><a class="footnote-ref" id="fnref:96" href="#fn:96"><sup>96</sup></a> multiple sclerosis,<a class="footnote-ref" id="fnref:97" href="#fn:97"><sup>97</sup></a> spinal cord injury, many headaches,<a class="footnote-ref" id="fnref:98" href="#fn:98"><sup>98</sup></a> and other conditions in which there is no useful <i><a href="/facts/In_vitro/evp3hAX6">in vitro</a></i> model system available. </p> <h2 id="selection">Selection</h2> <p>Models are those organisms with a wealth of biological data that make them attractive to study as examples for other <a href="/facts/Species/oDg6b96r">species</a> and/or natural phenomena that are more difficult to study directly. Continual research on these organisms focuses on a wide variety of experimental techniques and goals from many different levels of biology—from <a href="/facts/Ecology/YE8upuJU">ecology</a>, <a href="/facts/Behavior/0Y1VqmVX">behavior</a> and <a href="/facts/Biomechanics/H4qnnmu5">biomechanics</a>, down to the tiny functional scale of individual <a href="/facts/Tissue_(biology)/H7CpML7A">tissues</a>, <a href="/facts/Organelle/vhDFnGbs">organelles</a> and <a href="/facts/Protein/Jxmagu3E">proteins</a>. Inquiries about the DNA of organisms are classed as <a href="/facts/Genetics/bu8wne0A">genetic</a> models (with short generation times, such as the <a href="/facts/Drosophila_melanogaster/KtnHVCcB">fruitfly</a> and <a href="/facts/Caenorhabditis_elegans/XJVJzPn2">nematode</a> worm), <a href="/facts/Experimental/esltM54f">experimental</a> models, and <a href="/facts/Genomic/pVU3BGpL">genomic</a> parsimony models, investigating pivotal position in the evolutionary tree.<a class="footnote-ref" id="fnref:99" href="#fn:99"><sup>99</sup></a> Historically, model organisms include a handful of species with extensive genomic research data, such as the NIH model organisms.<a class="footnote-ref" id="fnref:100" href="#fn:100"><sup>100</sup></a> </p><p>Often, model organisms are chosen on the basis that they are amenable to experimental manipulation. This usually will include characteristics such as short <a href="/facts/Biological_life_cycle/1y28aNGG">life-cycle</a>, techniques for genetic manipulation (<a href="/facts/Inbreeding/KRoRX08G">inbred</a> strains, <a href="/facts/Stem_cell/qgB9dFrI">stem cell</a> lines, and methods of <a href="/facts/Transformation_(genetics)/n82cCRCu">transformation</a>) and non-specialist living requirements. Sometimes, the genome arrangement facilitates the sequencing of the model organism's genome, for example, by being very compact or having a low proportion of <a href="/facts/Junk_DNA/zyTU8q8M">junk DNA</a> (e.g. <a href="/facts/Saccharomyces_cerevisiae/sX9MGFrz">yeast</a>, <a href="/facts/Arabidopsis_thaliana/wt2IMJsC">arabidopsis</a>, or <a href="/facts/Takifugu_rubripes/XT8QhvBv">pufferfish</a>).<a class="footnote-ref" id="fnref:101" href="#fn:101"><sup>101</sup></a> </p><p>When researchers look for an organism to use in their studies, they look for several traits. Among these are size, <a href="/facts/Generation_time/J7m8p79J">generation time</a>, accessibility, manipulation, genetics, conservation of mechanisms, and potential economic benefit. As comparative <a href="/facts/Molecular_biology/YgqU35ub">molecular biology</a> has become more common, some researchers have sought model organisms from a wider assortment of <a href="/facts/Kinship_and_descent/grXkJ2u7">lineages</a> on the <a href="/facts/Tree_of_life_(science)/woHaYdLT">tree of life</a>. </p> <h3>Phylogeny and genetic relatedness</h3> <p>The primary reason for the use of model organisms in research is the evolutionary principle that all organisms share some degree of relatedness and genetic similarity due to <a href="/facts/Common_ancestry/bwEgMu7F">common ancestry</a>. The study of taxonomic human relatives, then, can provide a great deal of information about mechanism and disease within the human body that can be useful in medicine. </p><p>Various phylogenetic trees for vertebrates have been constructed using comparative <a href="/facts/Proteomics/3aqQ1tFh">proteomics</a>, genetics, genomics as well as the geochemical and fossil record.<a class="footnote-ref" id="fnref:102" href="#fn:102"><sup>102</sup></a> These estimations tell us that humans and chimpanzees last shared a common ancestor about 6 million years ago (mya). As our closest relatives, chimpanzees have a lot of potential to tell us about mechanisms of disease (and what genes may be responsible for human intelligence). However, chimpanzees are rarely used in research and are protected from highly invasive procedures. Rodents are the most common animal models. Phylogenetic trees estimate that humans and rodents last shared a common ancestor ~80-100mya.<a class="footnote-ref" id="fnref:103" href="#fn:103"><sup>103</sup></a><a class="footnote-ref" id="fnref:104" href="#fn:104"><sup>104</sup></a> Despite this distant split, humans and rodents have far more similarities than they do differences. This is due to the relative stability of large portions of the genome, making the use of vertebrate animals particularly productive. </p><p>Genomic data is used to make close comparisons between species and determine relatedness. Humans share about 99% of their genome with chimpanzees<a class="footnote-ref" id="fnref:105" href="#fn:105"><sup>105</sup></a><a class="footnote-ref" id="fnref:106" href="#fn:106"><sup>106</sup></a> (98.7% with bonobos)<a class="footnote-ref" id="fnref:107" href="#fn:107"><sup>107</sup></a> and over 90% with the mouse.<a class="footnote-ref" id="fnref:108" href="#fn:108"><sup>108</sup></a> With so much of the genome conserved across species, it is relatively impressive that the differences between humans and mice can be accounted for in approximately six thousand genes (of ~30,000 total). Scientists have been able to take advantage of these similarities in generating experimental and predictive models of human disease. </p> <h2 id="use">Use</h2> <p>There are many model organisms. One of the first model systems for <a href="/facts/Molecular_biology/YgqU35ub">molecular biology</a> was the bacterium <i><a href="/facts/Escherichia_coli/nR4Gvl56">Escherichia coli</a></i>, a common constituent of the human digestive system. Several of the bacterial viruses (<a href="/facts/Bacteriophage/L2Ll0T3q">bacteriophage</a>) that infect <i><a href="/facts/Escherichia_coli/nR4Gvl56">E. coli</a></i> also have been very useful for the study of gene structure and <a href="/facts/Gene_regulation/9N4G341I">gene regulation</a> (e.g. phages <a href="/facts/Lambda_phage/z17FFUSW">Lambda</a> and <a href="/facts/Enterobacteria_phage_T4/Af4UyJxy">T4</a>). However, it is debated whether bacteriophages should be classified as organisms, because they lack metabolism and depend on functions of the host cells for propagation.<a class="footnote-ref" id="fnref:109" href="#fn:109"><sup>109</sup></a> </p><p>In <a href="/facts/Eukaryote/SkwyPLMA">eukaryotes</a>, several yeasts, particularly <i><a href="/facts/Saccharomyces_cerevisiae/sX9MGFrz">Saccharomyces cerevisiae</a></i> ("baker's" or "budding" yeast), have been widely used in <a href="/facts/Genetics/bu8wne0A">genetics</a> and <a href="/facts/Cell_biology/kdIBGHub">cell biology</a>, largely because they are quick and easy to grow. The <a href="/facts/Cell_cycle/nLMT7K4r">cell cycle</a> in a simple <a href="/facts/Yeast/eGD24nfI">yeast</a> is very similar to the cell cycle in <a href="/facts/Human/rlcTENsr">humans</a> and is regulated by <a href="/facts/Homology_(biology)/muctKlyT">homologous</a> proteins. The fruit fly <i><a href="/facts/Drosophila_melanogaster/KtnHVCcB">Drosophila melanogaster</a></i> is studied, again, because it is easy to grow for an animal, has various visible congenital traits and has a <a href="/facts/Polytene/UsNWVl0S">polytene</a> (giant) chromosome in its salivary glands that can be examined under a light microscope. The <a href="/facts/Roundworm/yLMJ43Eu">roundworm</a> <i><a href="/facts/Caenorhabditis_elegans/XJVJzPn2">Caenorhabditis elegans</a></i> is studied because it has very defined development patterns involving fixed numbers of cells, and it can be rapidly assayed for abnormalities.<a class="footnote-ref" id="fnref:110" href="#fn:110"><sup>110</sup></a> </p> <h2 id="disease-models">Disease models</h2> <p class="note">Main article: <a href="/facts/Animal_disease_model/xPBrtWUX">Animal disease model</a></p> <p>Animal models serving in research may have an existing, inbred or induced <a href="/facts/Disease/55eeQlGL">disease</a> or injury that is similar to a human condition. These test conditions are often termed as animal models of disease. The use of animal models allows researchers to investigate disease states in ways which would be inaccessible in a human patient, performing procedures on the non-human animal that imply a level of harm that would not be considered ethical to inflict on a human. </p><p>The best models of disease are similar in <a href="/facts/Etiology/Bz8MAeSq">etiology</a> (mechanism of cause) and phenotype (signs and symptoms) to the human equivalent. However complex human diseases can often be better understood in a simplified system in which individual parts of the disease process are isolated and examined. For instance, behavioral analogues of <a href="/facts/Anxiety_(mood)/Geekl883">anxiety</a> or <a href="/facts/Pain/70E79oUn">pain</a> in laboratory animals can be used to screen and test new <a href="/facts/Medication/h9mhwWP2">drugs</a> for the treatment of these conditions in humans. A 2000 study found that animal models concorded (coincided on true positives and false negatives) with human toxicity in 71% of cases, with 63% for nonrodents alone and 43% for rodents alone.<a class="footnote-ref" id="fnref:111" href="#fn:111"><sup>111</sup></a> </p><p> In 1987, Davidson et al. suggested that selection of an animal model for research be based on nine considerations. These include </p><blockquote><p> 1) appropriateness as an analog, 2) transferability of information, 3) genetic uniformity of organisms, where applicable, 4) background knowledge of biological properties, 5) cost and availability, 6) generalizability of the results, 7) ease of and adaptability to experimental manipulation, 8) ecological consequences, and 9) ethical implications.<a class="footnote-ref" id="fnref:112" href="#fn:112"><sup>112</sup></a></p></blockquote> <p>Animal models can be classified as homologous, isomorphic or predictive. Animal models can also be more broadly classified into four categories: 1) experimental, 2) spontaneous, 3) negative, 4) orphan.<a class="footnote-ref" id="fnref:113" href="#fn:113"><sup>113</sup></a> </p><p>Experimental models are most common. These refer to models of disease that resemble human conditions in phenotype or response to treatment but are induced artificially in the laboratory. Some examples include: </p> <ul><li>The use of <a href="/facts/Metrazol/YhtrPgEd">metrazol</a> (pentylenetetrazol) as an animal model of <a href="/facts/Epilepsy/wawyp56a">epilepsy</a><a class="footnote-ref" id="fnref:114" href="#fn:114"><sup>114</sup></a></li> <li>Induction of mechanical brain injury as an animal model of <a href="/facts/Post-traumatic_epilepsy/b0uEXALG">post-traumatic epilepsy</a><a class="footnote-ref" id="fnref:115" href="#fn:115"><sup>115</sup></a></li> <li>Injection of the <a href="/facts/Neurotoxin/I7nLuFE7">neurotoxin</a> <a href="/facts/6-hydroxydopamine/J41UtvL0">6-hydroxydopamine</a> to dopaminergic parts of the basal ganglia as an animal model of <a href="/facts/Parkinson%27s_disease/xpekKj6x">Parkinson's disease</a>.<a class="footnote-ref" id="fnref:116" href="#fn:116"><sup>116</sup></a></li> <li><a href="/facts/Immunisation/f2NLoleW">Immunisation</a> with an auto-<a href="/facts/Antigen/9JlAernG">antigen</a> to induce an <a href="/facts/Immune_response/dtLulqIy">immune response</a> to model <a href="/facts/Autoimmune_diseases/sojBeQ7t">autoimmune diseases</a> such as <a href="/facts/Experimental_autoimmune_encephalomyelitis/P535A51J">Experimental autoimmune encephalomyelitis</a><a class="footnote-ref" id="fnref:117" href="#fn:117"><sup>117</sup></a></li> <li>Occlusion of the <a href="/facts/Middle_cerebral_artery/44Ka7zn2">middle cerebral artery</a> as an <a href="/facts/Animal_models_of_ischemic_stroke/q5taNB8D">animal model of ischemic stroke</a><a class="footnote-ref" id="fnref:118" href="#fn:118"><sup>118</sup></a></li> <li>Injection of blood in the <a href="/facts/Basal_ganglia/d9mbF6p3">basal ganglia</a> of <a href="/facts/Mus_musculus/A1fj6LQ2">mice</a> as a model for <a href="/facts/Hemorrhagic_stroke/DwpjdzY0">hemorrhagic stroke</a><a class="footnote-ref" id="fnref:119" href="#fn:119"><sup>119</sup></a><a class="footnote-ref" id="fnref:120" href="#fn:120"><sup>120</sup></a></li> <li><a href="/facts/Sepsis/n52bkffJ">Sepsis</a> and <a href="/facts/Septic_shock/yc9mgmrz">septic shock</a> induction by impairing the integrity of barrier tissues, administering live <a href="/facts/Pathogens/axMXtV1M">pathogens</a> or <a href="/facts/Toxins/11oUNk7n">toxins</a><a class="footnote-ref" id="fnref:121" href="#fn:121"><sup>121</sup></a></li> <li>Infecting animals with <a href="/facts/Pathogens/axMXtV1M">pathogens</a> to reproduce human <a href="/facts/Infectious_diseases/182XrncP">infectious diseases</a></li> <li>Injecting animals with <a href="/facts/Agonists/nz8U5NNp">agonists</a> or <a href="/facts/Receptor_antagonist/PuXHVNdV">antagonists</a> of various <a href="/facts/Neurotransmitter/LlpYFSU3">neurotransmitters</a> to reproduce human <a href="/facts/Mental_disorder/EPNjFtFf">mental disorders</a></li> <li>Using <a href="/facts/Ionizing_radiation/vw0d9GaT">ionizing radiation</a> to cause <a href="/facts/Tumors/K0ytzmPz">tumors</a></li> <li>Using gene transfer to cause <a href="/facts/Tumors/K0ytzmPz">tumors</a><a class="footnote-ref" id="fnref:122" href="#fn:122"><sup>122</sup></a><a class="footnote-ref" id="fnref:123" href="#fn:123"><sup>123</sup></a></li> <li>Implanting animals with <a href="/facts/Tumor/K0ytzmPz">tumors</a> to test and develop treatments using <a href="/facts/Ionizing_radiation/vw0d9GaT">ionizing radiation</a></li> <li><a href="/facts/Artificial_selection/CAkkM2UG">Genetically</a> selected (such as in <a href="/facts/Diabetes/2xeHXbsI">diabetic</a> <a href="/facts/Mus_musculus/A1fj6LQ2">mice</a> also known as <a href="/facts/NOD_mice/8bdnDbj2">NOD mice</a>)<a class="footnote-ref" id="fnref:124" href="#fn:124"><sup>124</sup></a></li> <li>Various animal models for screening of drugs for the treatment of <a href="/facts/Glaucoma/MWqWVNz3">glaucoma</a></li> <li>The use of the <a href="/facts/Ovariectomized_rat/tql9bUVq">ovariectomized rat</a> in <a href="/facts/Osteoporosis/xa1W00Tj">osteoporosis</a> research</li> <li>Use of <i><a href="/facts/Plasmodium_yoelii/bkDPrXIm">Plasmodium yoelii</a></i> as a model of human malaria<a class="footnote-ref" id="fnref:125" href="#fn:125"><sup>125</sup></a><a class="footnote-ref" id="fnref:126" href="#fn:126"><sup>126</sup></a><a class="footnote-ref" id="fnref:127" href="#fn:127"><sup>127</sup></a></li></ul> <p>Spontaneous models refer to diseases that are analogous to human conditions that occur naturally in the animal being studied. These models are rare, but informative. Negative models essentially refer to control animals, which are useful for validating an experimental result. Orphan models refer to diseases for which there is no human analog and occur exclusively in the species studied.<a class="footnote-ref" id="fnref:128" href="#fn:128"><sup>128</sup></a> </p><p>The increase in knowledge of the <a href="/facts/Genome/31Sm08JT">genomes</a> of non-human <a href="/facts/Primates/Hl8RNE2X">primates</a> and other <a href="/facts/Mammals/phSwTzBo">mammals</a> that are genetically close to humans is allowing the production of <a href="/facts/Genetic_engineering/vwdlDR61">genetically engineered</a> animal tissues, organs and even animal species which express human diseases, providing a more robust model of human diseases in an animal model. </p><p>Animal models observed in the sciences of <a href="/facts/Psychology/duoqW7Sz">psychology</a> and <a href="/facts/Sociology/d2Fd0N87">sociology</a> are often termed animal models of behavior. It is difficult to build an animal model that perfectly reproduces the <a href="/facts/Symptom/BzP6MrTN">symptoms</a> of depression in patients. Depression, as other <a href="/facts/Mental_disorders/EPNjFtFf">mental disorders</a>, consists of <a href="/facts/Endophenotype/FlCVJevn">endophenotypes</a><a class="footnote-ref" id="fnref:129" href="#fn:129"><sup>129</sup></a> that can be reproduced independently and evaluated in animals. An ideal animal model offers an opportunity to understand <a href="/facts/Molecular/N9ljSfFq">molecular</a>, <a href="/facts/Genetics/bu8wne0A">genetic</a> and <a href="/facts/Epigenetic/UfAAERcn">epigenetic</a> factors that may lead to depression. By using animal models, the underlying molecular alterations and the causal relationship between <a href="/facts/Heredity/t0aMmRWx">genetic</a> or environmental alterations and depression can be examined, which would afford a better insight into <a href="/facts/Pathology/U9b18LJG">pathology</a> of depression. In addition, <a href="/facts/Animal_models_of_depression/BY8mQuvh">animal models of depression</a> are indispensable for identifying novel <a href="/facts/Therapies/2ytkGbgT">therapies</a> for depression.<a class="footnote-ref" id="fnref:130" href="#fn:130"><sup>130</sup></a><a class="footnote-ref" id="fnref:131" href="#fn:131"><sup>131</sup></a> </p> <h2 id="important-model-organisms">Important model organisms</h2> <p class="note">See also: <a href="/facts/List_of_model_organisms/8yXcyFTX">List of model organisms</a></p> <p>Model organisms are drawn from all three <a href="/facts/Domain_(biology)/RpP6V7n6">domains</a> of life, as well as <a href="/facts/Virus/mf88Bcbl">viruses</a>. The most widely studied <a href="/facts/Prokaryote/oYyvaDDH">prokaryotic</a> model organism is <i><a href="/facts/Escherichia_coli/nR4Gvl56">Escherichia coli</a></i> (<i>E. coli</i>), which has been intensively investigated for over 60 years. It is a common, <a href="/facts/Gram-negative_bacteria/S1PbVtp4">gram-negative</a> gut bacterium which can be grown and cultured easily and inexpensively in a laboratory setting. It is the most widely used organism in <a href="/facts/Molecular_genetics/Q8wsm0FE">molecular genetics</a>, and is an important species in the fields of <a href="/facts/Biotechnology/8eFnI6FB">biotechnology</a> and <a href="/facts/Microbiology/k7udsq81">microbiology</a>, where it has served as the <a href="/facts/Host_organism/L6mop0kh">host organism</a> for the majority of work with <a href="/facts/Recombinant_DNA/dT3PL7M6">recombinant DNA</a>.<a class="footnote-ref" id="fnref:132" href="#fn:132"><sup>132</sup></a> </p><p>Simple model <a href="/facts/Eukaryote/SkwyPLMA">eukaryotes</a> include baker's yeast (<i><a href="/facts/Saccharomyces_cerevisiae/sX9MGFrz">Saccharomyces cerevisiae</a></i>) and fission yeast (<i><a href="/facts/Schizosaccharomyces_pombe/GztzsPnJ">Schizosaccharomyces pombe</a></i>), both of which share many characters with higher cells, including those of humans. For instance, many <a href="/facts/Cell_division/n5MrunWj">cell division</a> genes that are critical for the development of <a href="/facts/Cancer/PVW6n1D0">cancer</a> have been discovered in yeast. <i><a href="/facts/Chlamydomonas_reinhardtii/pycewMkj">Chlamydomonas reinhardtii</a></i>, a unicellular <a href="/facts/Green_alga/3NlQ6pKF">green alga</a> with well-studied genetics, is used to study <a href="/facts/Photosynthesis/TMV7w693">photosynthesis</a> and <a href="/facts/Motility/Df5BECHL">motility</a>. <i>C. reinhardtii</i> has many known and mapped mutants and expressed sequence tags, and there are advanced methods for genetic transformation and selection of genes.<a class="footnote-ref" id="fnref:133" href="#fn:133"><sup>133</sup></a> <i><a href="/facts/Dictyostelium_discoideum/A3wL6lx6">Dictyostelium discoideum</a></i> is used in <a href="/facts/Molecular_biology/YgqU35ub">molecular biology</a> and <a href="/facts/Genetics/bu8wne0A">genetics</a>, and is studied as an example of <a href="/facts/Cell_communication/6oYAVP9I">cell communication</a>, <a href="/facts/Cellular_differentiation/bCVqUG7w">differentiation</a>, and <a href="/facts/Programmed_cell_death/DWWhHTKj">programmed cell death</a>. </p> <p>Among invertebrates, the <a href="/facts/Drosophilidae/zN9sTMlD">fruit fly</a> <i><a href="/facts/Drosophila_melanogaster/KtnHVCcB">Drosophila melanogaster</a></i> is famous as the subject of genetics experiments by <a href="/facts/Thomas_Hunt_Morgan/4wswVmWC">Thomas Hunt Morgan</a> and others. They are easily raised in the lab, with rapid generations, high <a href="/facts/Fecundity/e0oMColj">fecundity</a>, few <a href="/facts/Chromosome/FRGf11FC">chromosomes</a>, and easily induced observable mutations.<a class="footnote-ref" id="fnref:134" href="#fn:134"><sup>134</sup></a> The <a href="/facts/Nematode/yLMJ43Eu">nematode</a> <i><a href="/facts/Caenorhabditis_elegans/XJVJzPn2">Caenorhabditis elegans</a></i> is used for understanding the genetic control of development and physiology. It was first proposed as a model for neuronal development by <a href="/facts/Sydney_Brenner/Ws4AzJu7">Sydney Brenner</a> in 1963, and has been extensively used in many different contexts since then.<a class="footnote-ref" id="fnref:135" href="#fn:135"><sup>135</sup></a><a class="footnote-ref" id="fnref:136" href="#fn:136"><sup>136</sup></a> <i>C. elegans</i> was the first multicellular organism whose genome was completely sequenced, and as of 2012, the only organism to have its <a href="/facts/Connectome/X5tjEwwl">connectome</a> (neuronal "wiring diagram") completed.<a class="footnote-ref" id="fnref:137" href="#fn:137"><sup>137</sup></a><a class="footnote-ref" id="fnref:138" href="#fn:138"><sup>138</sup></a> </p><p><i><a href="/facts/Arabidopsis_thaliana/wt2IMJsC">Arabidopsis thaliana</a></i> is currently the most popular model plant. Its small stature and short generation time facilitates rapid genetic studies,<a class="footnote-ref" id="fnref:139" href="#fn:139"><sup>139</sup></a> and many phenotypic and biochemical mutants have been mapped.<a class="footnote-ref" id="fnref:140" href="#fn:140"><sup>140</sup></a> <i>A. thaliana</i> was the first plant to have its <a href="/facts/Genome/31Sm08JT">genome</a> <a href="/facts/DNA_sequencing/hsPsNCQW">sequenced</a>.<a class="footnote-ref" id="fnref:141" href="#fn:141"><sup>141</sup></a> </p><p>Among <a href="/facts/Vertebrate/tT54FSTT">vertebrates</a>, <a href="/facts/Guinea_pig/gRXC2qNN">guinea pigs</a> (<i>Cavia porcellus</i>) were used by <a href="/facts/Robert_Koch/cUDapauh">Robert Koch</a> and other early bacteriologists as a host for bacterial infections, becoming a byword for "laboratory animal", but are less commonly used today. The classic model vertebrate is currently the mouse (<i><a href="/facts/House_mouse/A1fj6LQ2">Mus musculus</a></i>). Many inbred strains exist, as well as lines selected for particular traits, often of medical interest, e.g. body size, obesity, muscularity, and voluntary <a href="/facts/Wheel-running/GA1YUlu9">wheel-running</a> behavior.<a class="footnote-ref" id="fnref:142" href="#fn:142"><sup>142</sup></a> The rat (<i><a href="/facts/Rattus_norvegicus/6KzSs2qg">Rattus norvegicus</a></i>) is particularly useful as a toxicology model, and as a neurological model and source of primary cell cultures, owing to the larger size of organs and suborganellar structures relative to the mouse, while eggs and embryos from <i><a href="/facts/Xenopus_tropicalis/uoS2ALeT">Xenopus tropicalis</a></i> and <i><a href="/facts/Xenopus_laevis/khG1KPrd">Xenopus laevis</a></i> (African clawed frog) are used in developmental biology, cell biology, toxicology, and neuroscience.<a class="footnote-ref" id="fnref:143" href="#fn:143"><sup>143</sup></a><a class="footnote-ref" id="fnref:144" href="#fn:144"><sup>144</sup></a> Likewise, the <a href="/facts/Zebrafish/Nxg1F1mG">zebrafish</a> (<i>Danio rerio</i>) has a nearly transparent body during early development, which provides unique visual access to the animal's internal anatomy during this time period. Zebrafish are used to study development, toxicology and toxicopathology,<a class="footnote-ref" id="fnref:145" href="#fn:145"><sup>145</sup></a> specific gene function and roles of signaling pathways. </p><p>Other important model organisms and some of their uses include: <a href="/facts/T4_phage/Af4UyJxy">T4 phage</a> (viral infection), <i><a href="/facts/Tetrahymena_thermophila/jo72mbCS">Tetrahymena thermophila</a></i> (intracellular processes), <a href="/facts/Maize/lJ6c5xMH">maize</a> (<a href="/facts/Transposon/WbVMhuWR">transposons</a>), <i><a href="/facts/Hydra_(genus)/sdpMVp2e">hydras</a></i> (<a href="/facts/Regeneration_(biology)/DHkSrakp">regeneration</a> and <a href="/facts/Morphogenesis/zHJh8Eae">morphogenesis</a>),<a class="footnote-ref" id="fnref:146" href="#fn:146"><sup>146</sup></a> <a href="/facts/Cat/82d0y6D5">cats</a> (neurophysiology), <a href="/facts/Chicken/RD2eTd83">chickens</a> (development), <a href="/facts/Dog/DvQVRVzy">dogs</a> (respiratory and cardiovascular systems), <i><a href="/facts/Turquoise_killifish/LqHNGP9G">Nothobranchius furzeri</a></i> (aging),<a class="footnote-ref" id="fnref:147" href="#fn:147"><sup>147</sup></a> non-human primates such as the <a href="/facts/Rhesus_macaque/TkffMX9v">rhesus macaque</a> and <a href="/facts/Common_chimpanzee/JXSpFsHy">chimpanzee</a> (<a href="/facts/Hepatitis/FIN87T5e">hepatitis</a>, <a href="/facts/HIV/ulY2rgzu">HIV</a>, <a href="/facts/Parkinson%27s_disease/xpekKj6x">Parkinson's disease</a>, <a href="/facts/Cognition/ga0tSBul">cognition</a>, and <a href="/facts/Vaccine/QcXzLug2">vaccines</a>), and <a href="/facts/Ferret/rqrBoAu8">ferrets</a> (<a href="/facts/SARS-CoV-2/DxF8rDc1">SARS-CoV-2</a>)<a class="footnote-ref" id="fnref:148" href="#fn:148"><sup>148</sup></a> </p> <h3>Selected model organisms</h3> <p>The organisms below have become model organisms because they facilitate the study of certain characters or because of their genetic accessibility. For example, <a href="/facts/Escherichia_coli/nR4Gvl56"><i>E. coli</i></a> was one of the first organisms for which genetic techniques such as <a href="/facts/Transformation_(genetics)/n82cCRCu">transformation</a> or <a href="/facts/Genetic_engineering/vwdlDR61">genetic manipulation</a> has been developed. </p><p>The <a href="/facts/Genome/31Sm08JT">genomes</a> of all model species have been <a href="/facts/Genome_sequencing_project/sIYftGNF">sequenced</a>, including their <a href="/facts/Mitochondria/ErHqrdJ1">mitochondrial</a>/<a href="/facts/Chloroplast/fo8U3yTx">chloroplast</a> genomes. <a href="/facts/Model_organism_databases/jwfXHn56">Model organism databases</a> exist to provide researchers with a portal from which to download sequences (DNA, RNA, or protein) or to access functional information on specific genes, for example the sub-cellular localization of the gene product or its physiological role. </p> <table><tbody><tr><th></th><th>Model Organism</th><th>Common name</th><th>Informal classification</th><th>Usage (examples)</th></tr><tr><td>Virus</td><td><a href="/facts/Phi_X_174/P84nV47b">Phi X 174</a></td><td>ΦX174</td><td><a href="/facts/Virus/mf88Bcbl">Virus</a></td><td>evolution<a class="footnote-ref" id="fnref:149" href="#fn:149"><sup>149</sup></a></td></tr><tr><td rowspan="2">Prokaryotes</td><td><i><a href="/facts/Escherichia_coli/nR4Gvl56">Escherichia coli</a></i></td><td><i>E. coli</i></td><td><a href="/facts/Bacteria/wC8xSCsU">Bacteria</a></td><td>bacterial genetics, metabolism</td></tr><tr><td><i><a href="/facts/Pseudomonas_fluorescens/l5V1Y47D">Pseudomonas fluorescens</a></i></td><td><i>P. fluorescens</i></td><td><a href="/facts/Bacteria/wC8xSCsU">Bacteria</a></td><td>evolution, adaptive radiation<a class="footnote-ref" id="fnref:150" href="#fn:150"><sup>150</sup></a></td></tr><tr><td rowspan="6">Eukaryotes, unicellular</td><td><i><a href="/facts/Dictyostelium_discoideum/A3wL6lx6">Dictyostelium discoideum</a></i></td><td></td><td><a href="/facts/Amoeba/xxvUal7B">Amoeba</a></td><td>immunology, host–pathogen interactions<a class="footnote-ref" id="fnref:151" href="#fn:151"><sup>151</sup></a></td></tr><tr><td><i><a href="/facts/Saccharomyces_cerevisiae/sX9MGFrz">Saccharomyces cerevisiae</a></i></td><td>Brewer's yeastBaker's yeast</td><td><a href="/facts/Yeast/eGD24nfI">Yeast</a></td><td>cell division, organelles, etc.</td></tr><tr><td><i><a href="/facts/Schizosaccharomyces_pombe/GztzsPnJ">Schizosaccharomyces pombe</a></i></td><td>Fission yeast</td><td><a href="/facts/Yeast/eGD24nfI">Yeast</a></td><td>cell cycle, cytokinesis, chromosome biology, telomeres, DNA metabolism, cytoskeleton organization, industrial applications<a class="footnote-ref" id="fnref:152" href="#fn:152"><sup>152</sup></a><a class="footnote-ref" id="fnref:153" href="#fn:153"><sup>153</sup></a></td></tr><tr><td><i><a href="/facts/Chlamydomonas_reinhardtii/pycewMkj">Chlamydomonas reinhardtii</a></i></td><td></td><td><a href="/facts/Algae/U1ftVKU3">Algae</a></td><td>hydrogen production<a class="footnote-ref" id="fnref:154" href="#fn:154"><sup>154</sup></a></td></tr><tr><td><i><a href="/facts/Tetrahymena_thermophila/jo72mbCS">Tetrahymena thermophila</a></i>, <i><a href="/facts/Tetrahymena_pyriformis/jo72mbCS">T. pyriformis</a></i></td><td></td><td><a href="/facts/Ciliate/UREaeHEc">Ciliate</a></td><td>education,<a class="footnote-ref" id="fnref:155" href="#fn:155"><sup>155</sup></a> biomedical research<a class="footnote-ref" id="fnref:156" href="#fn:156"><sup>156</sup></a></td></tr><tr><td><i><a href="/facts/Emiliania_huxleyi/BaEDAqYy">Emiliania huxleyi</a></i></td><td></td><td><a href="/facts/Plankton/WGo3LU9T">Plankton</a></td><td>surface sea temperature<a class="footnote-ref" id="fnref:157" href="#fn:157"><sup>157</sup></a></td></tr><tr><td rowspan="3">Plants</td><td><i><a href="/facts/Arabidopsis_thaliana/wt2IMJsC">Arabidopsis thaliana</a></i></td><td>Thale cress</td><td><a href="/facts/Flowering_plant/E5eGYIvY">Flowering plant</a></td><td>population genetics<a class="footnote-ref" id="fnref:158" href="#fn:158"><sup>158</sup></a></td></tr><tr><td><i><a href="/facts/Physcomitrella_patens/d7BDL10J">Physcomitrella patens</a></i></td><td>Spreading earthmoss</td><td><a href="/facts/Moss/YF8Rbf8y">Moss</a></td><td>molecular farming<a class="footnote-ref" id="fnref:159" href="#fn:159"><sup>159</sup></a></td></tr><tr><td><i><a href="/facts/Populus_trichocarpa/ahy3fwJf">Populus trichocarpa</a></i></td><td>Balsam poplar</td><td><a href="/facts/Tree/HVVn3srN">Tree</a></td><td>drought tolerance, lignin biosynthesis, wood formation, plant biology, morphology, genetics, and ecology<a class="footnote-ref" id="fnref:160" href="#fn:160"><sup>160</sup></a></td></tr><tr><td rowspan="3">Animals, nonvertebrate</td><td><i><a href="/facts/Caenorhabditis_elegans/XJVJzPn2">Caenorhabditis elegans</a></i></td><td>Nematode, Roundworm</td><td><a href="/facts/Worm/FMrnWM8s">Worm</a></td><td>differentiation, development</td></tr><tr><td><i><a href="/facts/Drosophila_melanogaster/KtnHVCcB">Drosophila melanogaster</a></i></td><td>Fruit fly</td><td><a href="/facts/Insect/IgDNvnUL">Insect</a></td><td>developmental biology, human brain degenerative disease<a class="footnote-ref" id="fnref:161" href="#fn:161"><sup>161</sup></a><a class="footnote-ref" id="fnref:162" href="#fn:162"><sup>162</sup></a></td></tr><tr><td><i><a href="/facts/Callosobruchus_maculatus/VEgqQ7Mg">Callosobruchus maculatus</a></i></td><td>Cowpea Weevil</td><td><a href="/facts/Insect/IgDNvnUL">Insect</a></td><td>developmental biology</td></tr><tr><td rowspan="9">Animals, vertebrate</td><td><i><a href="/facts/Danio_rerio/Nxg1F1mG">Danio rerio</a></i></td><td>Zebrafish</td><td><a href="/facts/Fish/fln4gH9V">Fish</a></td><td>embryonic development</td></tr><tr><td><i><a href="/facts/Mummichog/baf3IG6h">Fundulus heteroclitus</a></i></td><td>Mummichog</td><td><a href="/facts/Fish/fln4gH9V">Fish</a></td><td><a href="/facts/Behavioral_endocrinology/X5021eD6">effect of hormones on behavior</a></td></tr><tr><td><i><a href="/facts/Nothobranchius_furzeri/LqHNGP9G">Nothobranchius furzeri</a></i></td><td>Turquoise killifish</td><td><a href="/facts/Fish/fln4gH9V">Fish</a></td><td>aging, disease, evolution</td></tr><tr><td><i><a href="/facts/Japanese_rice_fish/usqgNXME">Oryzias latipes</a></i></td><td>Japanese rice fish</td><td><a href="/facts/Fish/fln4gH9V">Fish</a></td><td>fish biology, sex determination<a class="footnote-ref" id="fnref:163" href="#fn:163"><sup>163</sup></a></td></tr><tr><td><i><a href="/facts/Anolis_carolinensis/q0K1x6Cs">Anolis carolinensis</a></i></td><td>Carolina anole</td><td><a href="/facts/Reptile/04n1uKf1">Reptile</a></td><td>reptile biology, evolution</td></tr><tr><td><i><a href="/facts/Mus_musculus/A1fj6LQ2">Mus musculus</a></i></td><td>House mouse</td><td><a href="/facts/Mammal/phSwTzBo">Mammal</a></td><td>disease model for humans</td></tr><tr><td><i><a href="/facts/Gallus_gallus/rjGBbNSe">Gallus gallus</a></i></td><td>Red junglefowl</td><td><a href="/facts/Bird/RJF6zwLP">Bird</a></td><td>embryological development and organogenesis</td></tr><tr><td><i><a href="/facts/Australian_zebra_finch/13lRRC59">Taeniopygia castanotis</a></i></td><td>Australian zebra finch</td><td><a href="/facts/Bird/RJF6zwLP">Bird</a></td><td>vocal learning, neurobiology<a class="footnote-ref" id="fnref:164" href="#fn:164"><sup>164</sup></a></td></tr><tr><td><i><a href="/facts/Xenopus_laevis/khG1KPrd">Xenopus laevis</a></i><i><a href="/facts/Western_clawed_frog/uoS2ALeT">Xenopus tropicalis</a></i><a class="footnote-ref" id="fnref:165" href="#fn:165"><sup>165</sup></a></td><td>African clawed frogWestern clawed frog</td><td><a href="/facts/Amphibian/r2BleD2W">Amphibian</a></td><td>embryonic development</td></tr></tbody></table> <h2 id="limitations">Limitations</h2> <p>Many animal models serving as test subjects in biomedical research, such as rats and mice, may be selectively <a href="/facts/Sedentary_lifestyle/17LNyhNV">sedentary</a>, <a href="/facts/Obese/RBF9y5Vl">obese</a> and <a href="/facts/Glucose_intolerance/MqWAdWQU">glucose intolerant</a>. This may confound their use to model human metabolic processes and diseases as these can be affected by dietary energy intake and <a href="/facts/Exercise/egYQjt8A">exercise</a>.<a class="footnote-ref" id="fnref:166" href="#fn:166"><sup>166</sup></a> Similarly, there are differences between the immune systems of model organisms and humans that lead to significantly altered responses to stimuli,<a class="footnote-ref" id="fnref:167" href="#fn:167"><sup>167</sup></a><a class="footnote-ref" id="fnref:168" href="#fn:168"><sup>168</sup></a><a class="footnote-ref" id="fnref:169" href="#fn:169"><sup>169</sup></a> although the underlying principles of genome function may be the same.<a class="footnote-ref" id="fnref:170" href="#fn:170"><sup>170</sup></a> The impoverished environments inside standard laboratory cages deny research animals of the mental and physical challenges are necessary for healthy emotional development.<a class="footnote-ref" id="fnref:171" href="#fn:171"><sup>171</sup></a> Without day-to-day variety, risks and rewards, and complex environments, some have argued that animal models are irrelevant models of human experience.<a class="footnote-ref" id="fnref:172" href="#fn:172"><sup>172</sup></a> </p><p>Mice differ from humans in several immune properties: mice are more resistant to some <a href="/facts/Toxins/11oUNk7n">toxins</a> than humans; have a lower total <a href="/facts/Neutrophil/KL6oTt8b">neutrophil</a> fraction in the <a href="/facts/Blood/03zEulkj">blood</a>, a lower <a href="/facts/Neutrophil/KL6oTt8b">neutrophil</a> <a href="/facts/Enzymatic/DSI1Fh7y">enzymatic</a> capacity, lower activity of the <a href="/facts/Complement_system/vRSrQDUv">complement system</a>, and a different set of <a href="/facts/Pentraxins/5cghHJPS">pentraxins</a> involved in the <a href="/facts/Inflammatory_process/Ura86MIy">inflammatory process</a>; and lack genes for important components of the immune system, such as <a href="/facts/Interleukin_8/evhcrTme">IL-8</a>, <a href="/facts/IL-37/nVmCDUnd">IL-37</a>, <a href="/facts/TLR10/f6w2Kup4">TLR10</a>, <a href="/facts/ICAM3/xdlyw3R7">ICAM-3</a>, etc.<a class="footnote-ref" id="fnref:173" href="#fn:173"><sup>173</sup></a> Laboratory mice reared in <a href="/facts/Specific-pathogen-free/yL4VJkJC">specific-pathogen-free</a> (SPF) conditions usually have a rather immature immune system with a deficit of <a href="/facts/Memory_T_cells/xsavrTuS">memory T cells</a>. These mice may have limited diversity of the <a href="/facts/Microbiota/V4ymrawz">microbiota</a>, which directly affects the immune system and the development of pathological conditions. Moreover, persistent virus infections (for example, <a href="/facts/Herpesviridae/UYN6h53P">herpesviruses</a>) are activated in humans, but not in <a href="/facts/Specific-pathogen-free/yL4VJkJC">SPF</a> mice, with <a href="/facts/Sepsis/n52bkffJ">septic</a> complications and may change the resistance to bacterial <a href="/facts/Coinfections/EhqK4Uqf">coinfections</a>. "Dirty" mice are possibly better suitable for mimicking human pathologies. In addition, inbred mouse strains are used in the overwhelming majority of studies, while the <a href="/facts/Human_population/tzYcheuD">human population</a> is heterogeneous, pointing to the importance of studies in interstrain hybrid, <a href="/facts/Outbred/6sAJ4Gh7">outbred</a>, and nonlinear mice.<a class="footnote-ref" id="fnref:174" href="#fn:174"><sup>174</sup></a> </p> <h3>Unintended bias</h3> <p>Some studies suggests that inadequate published data in animal testing may result in irreproducible research, with missing details about how experiments are done omitted from published papers or differences in testing that may introduce bias. Examples of hidden bias include a 2014 study from <a href="/facts/McGill_University/amouytVp">McGill University</a> in <a href="/facts/Montreal/uQQaWd1b">Montreal, Canada</a> which suggests that mice handled by men rather than women showed higher stress levels.<a class="footnote-ref" id="fnref:175" href="#fn:175"><sup>175</sup></a><a class="footnote-ref" id="fnref:176" href="#fn:176"><sup>176</sup></a><a class="footnote-ref" id="fnref:177" href="#fn:177"><sup>177</sup></a> Another study in 2016 suggested that gut <a href="/facts/Microbiota/V4ymrawz">microbiomes</a> in mice may have an impact upon scientific research.<a class="footnote-ref" id="fnref:178" href="#fn:178"><sup>178</sup></a> </p> <h3>Alternatives</h3> <p>Ethical concerns, as well as the cost, maintenance and relative inefficiency of animal research has encouraged development of alternative methods for the study of disease. Cell culture, or <i>in vitro</i> studies, provide an alternative that preserves the physiology of the living cell, but does not require the sacrifice of an animal for mechanistic studies. Human, inducible <a href="/facts/Pluripotent/81323LbR">pluripotent</a> stem cells can also elucidate new mechanisms for understanding cancer and cell regeneration. Imaging studies (such as MRI or PET scans) enable non-invasive study of human subjects. Recent advances in genetics and genomics can identify disease-associated genes, which can be targeted for therapies. </p><p>Many biomedical researchers argue that there is no substitute for a living organism when studying complex interactions in disease pathology or treatments.<a class="footnote-ref" id="fnref:179" href="#fn:179"><sup>179</sup></a><a class="footnote-ref" id="fnref:180" href="#fn:180"><sup>180</sup></a> </p> <h2 id="ethics">Ethics</h2> <p>Debate about the ethical use of animals in research dates at least as far back as 1822 when the British Parliament under pressure from British and Indian intellectuals enacted the first law for animal protection preventing cruelty to cattle.<a class="footnote-ref" id="fnref:181" href="#fn:181"><sup>181</sup></a> This was followed by the <a href="/facts/Cruelty_to_Animals_Act_1835/QTF8BudV">Cruelty to Animals Act 1835</a> and the <a href="/facts/Cruelty_to_Animals_Act_1849/7HFjJyhp">Cruelty to Animals Act 1849</a>, which criminalized ill-treating, over-driving, and torturing animals. In 1876, under pressure from the <a href="/facts/National_Anti-Vivisection_Society/TWv1L5M2">National Anti-Vivisection Society</a>, the Cruelty to Animals Act 1849 was amended to include regulations governing the use of animals in research. This new act stipulated that 1) experiments must be proven absolutely necessary for instruction, or to save or prolong human life; 2) animals must be properly anesthetized; and 3) animals must be killed as soon as the experiment is over. Today, these three principles are central to the laws and guidelines governing the use of animals and research. In the U.S., the Animal Welfare Act of 1970 (see also <a href="/facts/Laboratory_Animal_Welfare_Act/HNwxxjyh">Laboratory Animal Welfare Act</a>) set standards for animal use and care in research. This law is enforced by APHIS's Animal Care program.<a class="footnote-ref" id="fnref:182" href="#fn:182"><sup>182</sup></a> </p><p>In academic settings in which NIH funding is used for animal research, institutions are governed by the NIH Office of Laboratory Animal Welfare (OLAW). At each site, OLAW guidelines and standards are upheld by a local review board called the Institutional Animal Care and Use Committee (IACUC). All laboratory experiments involving living animals are reviewed and approved by this committee. In addition to proving the potential for benefit to human health, minimization of pain and distress, and timely and humane euthanasia, experimenters must justify their protocols based on the principles of Replacement, Reduction and Refinement.<a class="footnote-ref" id="fnref:183" href="#fn:183"><sup>183</sup></a> </p><p>"Replacement" refers to efforts to engage alternatives to animal use. This includes the use of computer models, non-living tissues and cells, and replacement of "higher-order" animals (primates and mammals) with "lower" order animals (e.g. cold-blooded animals, invertebrates) wherever possible.<a class="footnote-ref" id="fnref:184" href="#fn:184"><sup>184</sup></a> </p><p>"Reduction" refers to efforts to minimize number of animals used during the course of an experiment, as well as prevention of unnecessary replication of previous experiments. To satisfy this requirement, mathematical calculations of statistical power are employed to determine the minimum number of animals that can be used to get a statistically significant experimental result. </p><p>"Refinement" refers to efforts to make experimental design as painless and efficient as possible in order to minimize the suffering of each animal subject. </p> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/Animals_in_space/JCHcht6C">Animals in space</a></li> <li><a href="/facts/Animal_testing/mHMf98y8">Animal testing</a></li> <li><a href="/facts/Animal_testing_on_invertebrates/ALm071nQ">Animal testing on invertebrates</a></li> <li><a href="/facts/Animal_testing_on_rodents/sck4UY6N">Animal testing on rodents</a></li> <li><a href="/facts/Cellular_model/Ww1X47JA">Cellular model</a> (numerical), e.g., <i><a href="/facts/Mycoplasma_genitalium/DkncfS9T">Mycoplasma genitalium</a></i>.</li> <li><a href="/facts/Ensembl/dEhjvNaA">Ensembl</a> genome database of model organisms</li> <li><a href="/facts/Generic_Model_Organism_Database/gcMmv9gc">Generic Model Organism Database</a></li> <li><a href="/facts/Genome_project/sIYftGNF">Genome project</a></li> <li><a href="/facts/History_of_animal_testing/339hXPvq">History of animal testing</a></li> <li><a href="/facts/History_of_model_organisms/QX4wCgzu">History of model organisms</a></li> <li><a href="/facts/History_of_research_on_Arabidopsis_thaliana/EsB9MpcL">History of research</a> on <i><a href="/facts/Arabidopsis_thaliana/wt2IMJsC">Arabidopsis thaliana</a></i></li> <li><a href="/facts/History_of_research_on_Caenorhabditis_elegans/T0gWDTgU">History of research</a> on <i><a href="/facts/Caenorhabditis_elegans/XJVJzPn2">Caenorhabditis elegans</a></i></li> <li><a href="/facts/Mouse_models_of_breast_cancer_metastasis/cIIcJP5C">Mouse models of breast cancer metastasis</a></li> <li><a href="/facts/Mouse_model_of_colorectal_and_intestinal_cancer/Iwjcm8qA">Mouse model of colorectal and intestinal cancer</a></li> <li><a href="/facts/RefSeq/5kBXXR8s">RefSeq</a> - the Reference Sequence database</li></ul> <h2 id="further-reading">Further reading</h2> <ul><li>Marx, Vivien (June 2014). <a href="https://doi.org/10.1038%2Fnmeth.2966">"Models: stretching the skills of cell lines and mice"</a>. <i>Nature Methods</i>. 11 (6): 617–620. <a href="/facts/Doi_(identifier)/muM9Etpq">doi</a>:<a href="https://doi.org/10.1038%2Fnmeth.2966">10.1038/nmeth.2966</a>. <a href="/facts/PMID_(identifier)/JlHAvMHt">PMID</a> <a href="https://pubmed.ncbi.nlm.nih.gov/24874573">24874573</a>.</li> <li>Goldstein, Bob; King, Nicole (November 2016). <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5077642">"The Future of Cell Biology: Emerging Model Organisms"</a>. <i>Trends in Cell Biology</i>. 26 (11): 818–824. <a href="/facts/Doi_(identifier)/muM9Etpq">doi</a>:<a href="https://doi.org/10.1016%2Fj.tcb.2016.08.005">10.1016/j.tcb.2016.08.005</a>. <a href="/facts/PMC_(identifier)/dX1zMt71">PMC</a> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5077642">5077642</a>. <a href="/facts/PMID_(identifier)/JlHAvMHt">PMID</a> <a href="https://pubmed.ncbi.nlm.nih.gov/27639630">27639630</a>.</li> <li>Lloyd, Kent; Franklin, Craig; Lutz, Cat; Magnuson, Terry (June 2015). <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4636083">"Reproducibility: Use mouse biobanks or lose them"</a>. <i>Nature</i>. 522 (7555): 151–153. <a href="/facts/Bibcode_(identifier)/9HtdQSGB">Bibcode</a>:<a href="https://ui.adsabs.harvard.edu/abs/2015Natur.522..151L">2015Natur.522..151L</a>. <a href="/facts/Doi_(identifier)/muM9Etpq">doi</a>:<a href="https://doi.org/10.1038%2F522151a">10.1038/522151a</a>. <a href="/facts/PMC_(identifier)/dX1zMt71">PMC</a> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4636083">4636083</a>. <a href="/facts/PMID_(identifier)/JlHAvMHt">PMID</a> <a href="https://pubmed.ncbi.nlm.nih.gov/26062496">26062496</a>.</li></ul> <h2 id="external-links">External links</h2> <ul><li><a href="/facts/Wellcome_Sanger_Institute/uQchlx8p">Wellcome Trust description of model organisms</a></li> <li><a href="https://orip.nih.gov/comparative-medicine/programs/vertebrate-models/">National Institutes of Health Comparative Medicine Program Vertebrate Models</a></li> <li><a href="https://www.nigms.nih.gov/Education/Pages/modelorg_factsheet.aspx/">NIH Using Model Organisms to Study Human Disease</a></li> <li><a href="https://grants.nih.gov/grants/policy/model_organism/">National Institutes of Health Model Organism Sharing Policy</a></li> <li><a href="https://grants.nih.gov/grants/policy/air/why_are_animals.htm/">Why are Animals Used in NIH Research</a></li> <li><a href="http://www.fleming.gr/">Disease Animal Models – BSRC Alexander Fleming</a></li> <li><a href="http://emice.nci.nih.gov/">Emice</a> – <a href="/facts/National_Cancer_Institute/R4KbY7Pb">National Cancer Institute</a></li> <li><a href="https://www.komp.org/">Knock Out Mouse Project – KOMP</a></li> <li><a href="https://mbp.mousebiology.org/">Mouse Biology Program</a></li> <li><a href="https://www.mmrrc.org/">Mutant Mouse Resource & Research Centers, National Institutes of Health, supported Mouse Repository</a></li> <li><a href="http://www.rrrc.us/">Rat Resource & Research Center</a> – <a href="/facts/National_Institutes_of_Health/G3Eytfcc">National Institutes of Health</a>, supported Rat Repository</li> <li><a href="https://www.mmrrc.org/about/reproducibility.php/">NIH Model Organism Research Reproducibility and Rigor</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Fields, S.; Johnston, M (2005-03-25). "CELL BIOLOGY: Whither Model Organism Research?". Science. 307 (5717): 1885–1886. doi:10.1126/science.1108872. PMID 15790833. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Griffiths, E. C. (2010) What is a model? Archived March 12, 2012, at the Wayback Machine <a href="http://www.emily-griffiths.postgrad.shef.ac.uk/models.pdf" target="_blank">http://www.emily-griffiths.postgrad.shef.ac.uk/models.pdf</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Fox, Michael Allen (1986). The Case for Animal Experimention: An Evolutionary and Ethical Perspective. Berkeley and Los Angeles, California: University of California Press. ISBN 978-0-520-05501-8. OCLC 11754940 – via Google Books. <a href="978-0-520-05501-8" target="_blank">978-0-520-05501-8</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Allmon, Warren D.; Ross, Robert M. (December 2018). "Evolutionary remnants as widely accessible evidence for evolution: the structure of the argument for application to evolution education". Evolution: Education and Outreach. 11 (1): 1. doi:10.1186/s12052-017-0075-1. <a href="https://doi.org/10.1186%2Fs12052-017-0075-1" target="_blank">https://doi.org/10.1186%2Fs12052-017-0075-1</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>Royal Society of Medicine (13 May 2015). "Statement of the Royal Society's position on the use of animals in research". From antibiotics and insulin to blood transfusions and treatments for cancer or HIV, virtually every medical achievement in the past century has depended directly or indirectly on research using animals, including veterinary medicine. <a href="https://royalsociety.org/topics-policy/publications/2015/animals-in-research/" target="_blank">https://royalsociety.org/topics-policy/publications/2015/animals-in-research/</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>National Research Council and Institute of Medicine (1988). Use of Laboratory Animals in Biomedical and Behavioral Research. National Academies Press. p. 37. ISBN 9780309038393. NAP:13195. The...methods of scientific inquiry have greatly reduced the incidence of human disease and have substantially increased life expectancy. Those results have come largely through experimental methods based in part on the use of animals. <a href="9780309038393" target="_blank">9780309038393</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>Lieschke, Graham J.; Currie, Peter D. (May 2007). "Animal models of human disease: zebrafish swim into view". Nature Reviews Genetics. 8 (5): 353–367. doi:10.1038/nrg2091. PMID 17440532. Biomedical research depends on the use of animal models to understand the pathogenesis of human disease at a cellular and molecular level and to provide systems for developing and testing new therapies. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> <li id="fn:8"><p>National Research Council and Institute of Medicine (1988). Use of Laboratory Animals in Biomedical and Behavioral Research. National Academies Press. p. 27. ISBN 9780309038393. NAP:13195. Animal studies have been an essential component of every field of medical research and have been crucial for the acquisition of basic knowledge in biology. <a href="9780309038393" target="_blank">9780309038393</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></p></li> <li id="fn:9"><p>Hau and Shapiro 2011: Jann Hau; Steven J. Schapiro (2011). Handbook of Laboratory Animal Science, Volume I, Third Edition: Essential Principles and Practices. CRC Press. p. 2. ISBN 978-1-4200-8456-6. Animal-based research has played a key role in understanding infectious diseases, neuroscience, physiology, and toxicology. Experimental results from animal studies have served as the basis for many key biomedical breakthroughs. Jann Hau; Steven J. Schapiro (2011). Handbook of Laboratory Animal Science, Volume II, Third Edition: Animal Models. CRC Press. p. 1. ISBN 978-1-4200-8458-0. Most of our basic knowledge of human biochemistry, physiology, endocrinology, and pharmacology has been derived from initial studies of mechanisms in animal models. <a href="978-1-4200-8456-6978-1-4200-8458-0" target="_blank">978-1-4200-8456-6978-1-4200-8458-0</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></p></li> <li id="fn:10"><p>Royal Society of Medicine (13 May 2015). "Statement of the Royal Society's position on the use of animals in research". From antibiotics and insulin to blood transfusions and treatments for cancer or HIV, virtually every medical achievement in the past century has depended directly or indirectly on research using animals, including veterinary medicine. <a href="https://royalsociety.org/topics-policy/publications/2015/animals-in-research/" target="_blank">https://royalsociety.org/topics-policy/publications/2015/animals-in-research/</a> <a href="#fnref:10" class="footnote-back-ref">↩</a></p></li> <li id="fn:11"><p>Institute of Medicine (1991). 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