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Barr bodyMain Entry: Barr body Pronunciation: \ˈbär-\ Function: noun Etymology: Murray Llewellyn Barr †1995 Canadian anatomist Date: 1961 : a densely staining inactivated condensed X chromosome that is present in each somatic cell of most female mammals and is used as a test of genetic femaleness (as in a fetus) —called also sex chromatin
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