Abstract
The serological relatedness of the idiotypic (ID) determinants of one type lambda light chain dimer and fifteen monoclonal IgG cryoglobulins were assayed. Rabbits were immunized with 9/15 IgG cryoglobulins, and twenty-three antisera were obtained and absorbed to render them specific for the ID determinant of the immunizing IgG cryoglobulin. By use of haemagglutination-inhibition, cross-reactivity was detected among five cryoglobulins. This was localized to the Fab region of the IgG, was not related to identity of the variable region subgroups of the heavy and light chains of the cross-reactive cryoglobulins, and was not detected in eighteen non-cryoprecipitable IgG myeloma proteins. The serological relatedness of the ID determinants suggests that a subset of IgG cryoglobulins may possibly have similar variable region structures and/or antigenic specificities.
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Selected References
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