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Antisera produced against certain isolated human antibodies showed clear antigenic differences between these antibodies. Individual antigenic specificity was demonstrated for two anti-A antibodies, one anti-dextran, and one anti-levan antibody. Failure to produce specific antisera in other instances appeared to be correlated with a greater heterogeneity of the antibody population used as antigen.
Kunkel et al. (1963) studied this question.