Genetic Polymorphism of C′3(β 1C -Globulin) in Human Serum

Abstract
Genetic polymorphism of the third component of human complement and its breakdown products has been detected in human serum by high-voltage starch-gel electrophoresis. Six phenotypes were observed in a study of 113 randomly chosen Caucasians. Their inheritance is controlled by four codominant alleles at an autosomal locus. The gene frequencies in this study were C31, 0.21; C32, 0.77; C33, ∼0.01; and C34, ∼0.004.