The blood groups of the Seneca Indians.

Blood specimens from 324 Seneca Indians were examined for antigens of several blood group systems employing 29 antisera of different specificities. Characteristics expected of an American Indian population were found: high frequencies of O, M, R2, k, and Fy a; low frequencies of A2, B, Lua, and the Le (a+) phenotype. The incidence of Di(a+) individuals was only 3.1% in sharp contrast with the fairly uniform incidence between 8% and 18% among previously studied northeastern Indians. One Mi(a+) person was encountered, the first reported example in North American Indians.