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We cloned, sequenced, and mapped two divergent major histocompatibility class Ib genes from BALB/c mice. M9d and M10d both have the potential to encode full-length class I molecules, but transcripts were not readily detectable. M9 is 86% similar to M1 in its nucleotide sequence and maps next to it on YAC clones. M9 is only 64% similar to M10 and 60% to H2-K k. Probes from M10 define a new subfamily of eight class I genes in C3H mice; five cluster directly distal to H2-T1, and three are located between M9-1-7-8 and M6-4-5 in the H2-M region.