Frequency of platelet-specific antigens PlA1, Baka, Yuka, Yukb, and Bra in South American (Mapuches) Indians.

One hundred twelve unrelated Mapuches Indians from the area of Temuco, Chile were studied for the prevalence of five platelet-specific antigens. The prevalences found were: PlA1 (Zwa), greater than 99 percent; Baka, 89.3 percent; Yuka (Penb), 0.9 percent; Yukb (Pena), greater than 99 percent; and Bra, 4.9 percent.