The antigen Yk-a is detected in 92 and 98% of the American Caucasian and Negro populations, respectively. In population studies with anti-Yk-a and anti-Cs-a, association was demonstrated between the two antigens; however, in two of three informative families Yk-a and Cs-a segregated independently. The possibility that these antigens have a relationship with leucocyte antigens is discussed.
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Molthan et al. (1975) studied this question.
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