WHAT IS BARR BODY ANALYSIS BUCCAL SMEAR FOR STAINING SEX CHROMATIN MASS TEST?
A Barr body, or sex chromatin body, is a tightly coiled X chromosome lying against the nuclear membrane of female cells or any cell with more than one X chromosome. It appears as a dark-staining body in the shape of a half-moon and is absent in male cells. Barr bodies are believed to function in early embryonic development and later become inactivated to maintain gene balance of Xs to autosomes. The number of Barr bodies in a client is one less than the number of Xs.