Epigenetics

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A topic known well beyond its field, found in many languages.

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What Wikipedia says

Epigenetics is the study of changes in gene expression that occur without altering the DNA sequence. The Greek prefix epi- (ἐπι- "over, outside of, around") in epigenetics implies features that are "on top of" or "in addition to" the traditional DNA-sequence-based mechanism of inheritance.

Excerpt from the Wikipedia article “Epigenetics”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Henri Pidoux, CC BY-SA 3.0, via Wikimedia Commons.