A New Antigen, McCa(McCoy), and Its Relationship to Kna(Knops)

Abstract
The antigen McCa is detected in 98.5% and 96.7% of the American Caucasian and Negro populations, respectively. In population studies with anti-McCa and anti-Kna, a strong association was demonstrated between the 2 antigens, with 53% of McC(a-) samples being Kn(a-) compared with a reported frequency for Kn(a-) of only 0.19%.

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