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The murine major histocompatibility complex (MHC) includes sequences that are responsible for haplotype-specific odor types that, in turn, influence mating preference. We report that there are several olfactory receptor genes or pseudogenes in the Class I region of the human MHC. At least one of these genes is intact, appears to encode an mRNA, and is quite homologous to a previously reported murine olfactory receptor.
Fan et al. (1995) studied this question.