Expression of Group b Light Chain Allotypes in Cottontail Rabbits

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Abstract
Group b allotypic determinants (b4, b5, b6, and b9) were detected on cottontail IgG by several assays including immunodiffusion, radioimmune binding, and inhibition of radiobinding. The results indicate that cottontail IgG possess some but not all of the subspecificities present on domestic rabbit IgG. Several cottontail rabbits exhibited three of the four possible allotypic markers. In these instances, however, only two populations of IgG molecules (i.e., phenogroups) could be detected, each bearing one, two, or three of the allotypes. Five separate and distinctive phenogroups were identified. The results suggest that the phenogroups represent products of multiple allelic genes for the constant region of cottontail rabbit κ light chain.

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