Chimpanzee simian-type blood groups: reproducibility of formerly described antisera and demonstration of new blood groups Oc and Pc1.

A chimpanzee of simian-type blood groups V.A, cef, G, H, L was isoimmunized with the red cells of another chimpanzee of simian-type V.B, cef, G, H, 1 in order to obtain antibodies of specificity anti-Bc, originally produced in another chimpanzee in 1964. In addition to the desired anti-Bc, the immunized chimpanzee produced also three other antibodies; anti-Yc cross-reactive with chimpanzee red cells of the simian-type Bc and/or Dc, a potent cold autoantibody reactive for red cells of all chimpanzees tested, and 'new' antibodies anti-Oc and anti-Pc. This study confirms the reproducibility of results obtained over a period of 13 years.