title: A new antigen, McCa (McCoy), and its relationship to Kna(Knops).
abstract: The antigen McCa is detected in 98.5 and 96.7 per cent of the American Caucasian and Negro populations respectively. In population studies with anti-McCa and anti-Kna, a strong association was demonstrated between the two antigens, with 53 per cent of McC(a-) sample being Kn(a-) compared with a reported frequency for Kn(a-) of only 0.19 per cent.
mesh_terms: D000328:Adult; D000917:Antibody Formation; D001789:Blood Group Antigens; D005260:Female; D006801:Humans; D007518:Isoantibodies; D008297:Male; D011153:Population
chemical_list: D001789:Blood Group Antigens; D007518:Isoantibodies