Simian Blood Groups Another Blood Group System, C‐E‐F, in Chimpanzees

Of eight chimpanzees which completed the course of immunization with red cells of other chimpanzees, five responded by producing antibodies of two different specificities previously not encountered and designated anti‐Ec and anti‐Fc, respectively. Serological and statistical evidence is presented indicating that the blood factors Ec and Fc detected by these antisera, together with the blood factor Cc previously described, define a blood group system designated the C‐E‐F system. Th C‐E‐F system is thus the second blood group system, not counting the human‐type A‐B‐O system, to be identified in chimpanzees.