RT Journal Article SR Electronic T1 Heterogeneity of Immune Anti-A Antibody in Relation to Forssman Antigen JF The Journal of Immunology JO J. Immunol. FD American Association of Immunologists SP 304 OP 310 VO 96 IS 2 A1 Yokoyama, Mitsuo A1 Fudenberg, H. H. YR 1966 UL http://www.jimmunol.org/content/96/2/304.abstract AB Guinea pig antigen, sheep red cells (type R), human group A1 red cells and soluble specific blood group substance A contain a similar A-like antigenic determinant. The A-like antigen of certain pig red cells (API) reacts with “immune” but not with “naturally occurring” anti-A antibody in human serum. Pig Ap red cells also absorb anti-sheep red cell hemolysin from human sera containing “immune” anti-A antibody, but not from those containing “naturally occurring” anti-A; furthermore, such cells do not absorb the anti-sheep red cell hemolysin present in immune rabbit serum. These results suggest that immune group O sera may contain an antibody specific against both A antigen and Forssman antigen.