Abstract
Examination of 78 sera from chimpanzees (Pan troglodytes) by immuno-electrophoresis, by gel electrophoresis on polyacrylamide, and by the two-dimensional antigen-antibody crossed electrophoresis confirms earlier observations: (1) The group-specific component in serum of chimpanzees has an electrophoretic mobility different from the human Gc 1–1 und Gc 2–2. (2) In contrast to man, a single phenotype is observed in chimpanzees; genetic variants in polymorphic frequencies can not be detected. (3) The Gc of chimpanzee serum is susceptible to induced alterations during storage and repeated thawings and freezings.

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