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atomic clock. an extremely accurate electronic clock regulated by the resonance frequency of atoms or molecules of certain substances, as cesium.
Also known as epigenetic clock, DNA clock, Horvath's clock or DNA methylation age, this biological aging clock is an age predictor that can be used to measure the age of most human tissues, cell types, or organs.ut it has been difficult to detect an accelerated aging effect on a molecular level. An epigenetic clock analysis of human DNA from HIV+ subjects and controls detected a significant age acceleration effect in brain (7.4 years) and blood (5.2 years) tissue due to HIV-1 infection.