Degeneracy of antibody specificity.

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Abstract
Evidence was obtained, by direct binding assays (radioimmunoassays) and by inhibition of binding assays, that after immunization some of the antibody molecules produced are degenerate in that they bind not only the immunizing antigen, but also unrelated ligands. It can be concluded that the exquisite specificity of the immune response is not necessarily a property of any given antibody molecule but is, at least to some extent, due to the summation of specificities held in common by the population of antibody molecules produced during the response.