Abstract
Seven BALB/c IgM, 4 BALB/c IgA, and 1 C57BL/6 IgA anti-alpha (1 replaced by 6) dextran hybridoma antibodies were characterized idiotypically. Five of the 7 IgM and all 4 BALB/c IgA proteins bear a cross-reactive idiotype present on the anti-alpha (1 replaced by 6) dextran BALB/c myeloma protein QUPC52 and on a majority of anti-alpha (1 replaced by 6) dextran antibodies in BALB/c mice. Of these 9 monoclonal antibodies, some have combining sites as large as 6 glucose residues, and some have combining sites as large as 7 glucose residues. Individual idiotypes present on QUPC52 are differentially expressed on the 9 hybridoma proteins that bear the cross-reactive idiotype. One BALB/c IgM hybridoma protein and the C57BL/6 IgA hybridoma protein did not react with anti-QUPC52 idiotypic antibodies; another BALB/c IgM hybridoma antibody showed only marginal reactivity.
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