Antigenic Specificities Related to the Cold Agglutinin Activity of Gamma M Globulins

Abstract
Certain antiserums prepared against isolated cold agglutinins demonstrate specificity for gamma M globulins with this activity and not for similar gamma M globulins lacking such activity. The cold agglutinin specific antigens fall into several major and minor groups. Their exact relation to the presumed antibody-combining sites remains to be determined.