Condensed mass of one inactivated X chromosome seen inside the nuclear membrane of an interphase cell.
Note: The Barr body is not seen in normal male cells (XY), but one body may be seen in normal female cells (XX). In
chromosomal abnormalities, the number seen is one less than the number of X chromosomes.
See also: Lyon hypothesis
Source:
PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 804 (https://doi.org/10.1515/pac-2015-1202)