Murine Ia antigens: Identification and mapping of Ia.23 and further definition of the I-E subregion

The Ia.23 specificity is a private specificity of the H-2(d) haplotype which we have assigned to the I-E subregion. It is found on the same Ia molecule that bears Ia.7, a public specificity previously assigned to the I-C subregion of haplotypes H-2(d), H-2(k), H-2(p) and H-2(r). We suggest a reassignment of specificity Ia.7 to the I-E subregion to simplify the interpretation of the data presented in this paper and elsewhere, and to permit an orderly description of that part of the I region to the right of I-J.