Abstract
The rabbit kappa 2 light chain subtype was described after isolation of the Basilea mutant strain, which does not express the kappa 1 subtype; antibodies raised in domestic rabbits against the Basilea kappa 2 chain recognized antigenic determinants present in Basilea strain rabbits and in some wild Oryctolagus cuniculus individuals. Some authors have proposed that the kappa 2 isotype is expressed in some individuals and is silent in others. The results presented here provide immunochemical and genetic evidence that the kappa 2 isotype presents at least two allotypic forms, bas 1 (equivalent to bas+) and bas 2 (equivalent to the so-called bas-), which are expressed in low levels in all members of the rabbit species. In addition, preliminary data on the expression of the bas 2 allotype in some hares (Lepus capensis) are reported. On the basis of these results, the rules guiding the selection of kappa 1 and kappa 2 isotypic light chain expression in this species may now be approached.
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