title: TRISOMY-21 AND BLOOD GROUP FREQUENCIES.
mesh_terms: D000017:ABO Blood-Group System; D001789:Blood Group Antigens; D004314:Down Syndrome; D012106:Research; D012204:Rh-Hr Blood-Group System; D014314:Trisomy
chemical_list: D000017:ABO Blood-Group System; D001789:Blood Group Antigens; D012204:Rh-Hr Blood-Group System
keywords: ABO FACTORS; EXPERIMENTAL LAB STUDY; RH FACTORS; TRISOMY