Transplacental passage of fetal erythrocytes during pregnancy.
D004899:Erythroblastosis, Fetal / Q000209:etiology*; D004912:Erythrocytes; D005260:Female; D006801:Humans; D008431:Maternal-Fetal Exchange; D011247:Pregnancy; D012204:Rh-Hr Blood-Group System
D012204:Rh-Hr Blood-Group System