Abstract

Normal rabbit sera, absorbed with normal human red cells, contained a γM‐globulin causing reversible agglutination of trypsinised human red cells. The amount of this antibody increased after immunization with normal human red cells, and it now consisted of both γM‐ and γG‐globulin. The agglutination was still reversible.The experiments supported the hypothesis that the natural antibody in human sera causing reversible agglutination of trypsinised human red cells is due to antigenic stimulation by structures revealed on normal red cells during their destruction in vivo.

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