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The binding of rabbit anti-human IgG labeled with 125I, shellfish glycogen or ferritin to human IgG attached to the surface of rabbit RBC with chromic chloride was studied. Maximum binding was noted with 125I labeled antibody. Slightly but consistently less binding was found with shellfish glycogen labeled antibody. The binding of ferritin labeled antibody was strikingly reduced--usually one-third or less of that found with 125I labeled antibody alone. This suggests that under the conditions of these experiments, the attachment of large labels to antibody molecules results in reduced antibody binding to surface antigen. Steric hindrance is probably at least in part responsible for this reduced binding.

Steric hindrance as a factor in the reaction of labeled antibody with cell surface antigenic determinants.