[Specificity of anti-ApA antibodies].

Antibodies to ApA elicited in Rabbits by immunization with bovine serum albumin-ApA conjugate have been purified by affinity chromatography. These purified antibodies react with bovine serum albumin-AMP, 8 bromo AMP, ApA conjugates as shown by gel diffusion. The association constants for the binding of antibodies and several haptens were deduced from dialysis equilibrium. The number of bound hapten molecules per antibody binding site depends upon the nature of the hapten.