title: H-2U: a new region at the D end of the murine MHC.
abstract: A new genetic region, mapping within the H-2 complex, has been serologically defined with several alloantisera raised in mice which differ at the D region. When these antisera were absorbed to remove H-2D antibodies, residual antibody activity remained that reacted in a strain-specific manner, and the antigens involved mapped to a new genetic region between the S and D regions. Two allelic variants relating to the d and k haplotypes have been defined by genetic mapping studies. This new region has been designated H-2U and the antigens it controls appear to resemble Ia antigens in their cellular distribution and molecular weight. The new antigen is primarily expressed on B cells, and is carried on protein molecules having approximate molecular weights of 36 000 and 60 000 daltons and resembling the alpha and alpha--beta chain dimer characteristic of Ia antigens.
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology*; D002874:Chromosome Mapping; D006183:H-2 Antigens / Q000235:genetics*; D000949:Histocompatibility Antigens Class II / Q000235:genetics*; D008285:Major Histocompatibility Complex; D051379:Mice; D008970:Molecular Weight; D013154:Spleen / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology; D013950:Thymus Gland / Q000276:immunology
chemical_list: D006183:H-2 Antigens; D000949:Histocompatibility Antigens Class II