Identification of Male Cardiomyocytes of Extracardiac Origin in the Hearts of Women with Male Progeny: Male Fetal Cell Microchimerism of the Heart

This study identified male cardiomyocytes of extracardiac origin, presumably fetal, in the hearts of 2 women with male progeny. Fetal progenitor cells may colonize the heart and under appropriate microenvironmental stimuli, differentiate into cardiomyocytes.