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Epigenetics: definition
Epigenetics is the study of changes in gene activity that don't involve changes to the DNA sequence itself — such as DNA methylation and histone modifications.
Epigenetics, explained
Epigenetic marks act like switches and dimmers on genes. They're influenced by development, age, environment, diet, stress, sleep, exercise and exposures such as smoking.
Why it matters
Epigenetics explains why genes aren't destiny: habits influence how your genes are expressed.
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