Abstract
Monoclonal antibodies raised against Xenopus Ig recognize antigenic determinants on IgM and low mol. wt Ig (LMW Ig or IgY). On SDS-PAGE two forms of μ were distinguished in the supernatant and cell lysate of tunicamycin-treated spleen cell culture. The two bands of v observed in serum appear to be the result of carbohydrate heterogeneity. The light chains resolved into two distinct bands which differed in peptide maps; the more slowly migrating band of light chain was preferentially associated with v. Patterns of cross-reactivity between the immunoglobulins of 11 species of Xenopus and three subspecies of Xenopus laevis were obtained; the polymorphism of μ and η antigenic determinants and its implications for species divergence are discussed.
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