Immunoprecipitation and SDS-PAGE analysis were used to examine H-2 and Ia antigens from mouse strains with wild-derived MHC haplotypes. Antisera raised against the wild-derived strains contained anti-H-2 and anti-Ia antibodies which precipitated antigen molecules readily distinguishable by a single assay procedure. The antibodies to wild strains were cross-reactive with standard laboratory haplotypes. Evidence supporting the similar genetic organization of wild and standard haplotypes was found, including isolation of separate H-2K and H-2D molecules from a wild-derived strain, and isolation of two separate Ia molecules from a wild-derived strain.

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