epigenetics
n.— «An ichthyologist (fish scientist), who specializes in epigenetics, the study of physical and chemical changes, became the first scientist from the West to examine the radioactive countryside up close.» —“Nuclear plant still leaking, but life around it had some surprises for first Western scientist to get a close look Chernobyl: How plants and animals have adapted” by Donald Grant Globe and Mail (Toronto, Can.) Aug. 18, 1990. (source: Double-Tongued Dictionary)