Subclasses of Human γ 2 -Globulin Based on Differences in the Heavy Polypeptide Chains

Abstract
Three subclasses of human γ2-globulin (IgG) molecules were detected in normal human serum with antiserums prepared in monkeys. These subclasses, designated γ2a-, γ2b-, and γ2c-globulins, have antibody activity. The distinguishing antigenic characteristics of each subclass were associated with the heavy polypeptide chains and the F (fast) fragments resulting from treatment of γ2-globulins with papain.