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Epigenetic clock
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<p>An epigenetic clock is a <a href="/facts/Biomarkers_of_aging/91a4kbsy">biochemical test</a> that can be used to measure age. The test is based on modifications that change over time and regulate how genes are expressed. Typically, the test examines <a href="/facts/DNA_methylation/npoRhsnX">DNA methylation</a> levels, measuring the accumulation of methyl groups to one's DNA molecules, or more recently, based on the <a href="/facts/Histone_code/tVqRoRXc">histone code</a>. </p>