Serological and biochemical characterization of class II antigens in B10.W lines

Class II molecules of 17 B10.W lines (i.e., congenic lines carrying H‐2 haplotypes of wild mice on C57BL/10Sn or B10 strain background) were analyzed by immunochemical methods of precipitation and co‐precipitation. The analysis included typing for previously defined antigenic determinants, as well as determinants defined by new reagents, and mapping of the genes controlling these determinants. Using this approach, an Ia chart of the typed B10.W lines could be constructed. Genes controlling determinants Ia.38, 102, 103, 104, 105, and 106 were mapped into A (A_β or A_α) locus; genes controlling determinants Ia.41, 107, 108, and 109 were mapped in the E (E_β or E_α) locus. The study suggests that the polymorphism of at least some of the class II loci could be as high as that of the class I loci.