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pubmed-article:2062867pubmed:abstractTextThe amino acid heterozygosities per site for HLA-A and -B loci are determined to be extremely high by combining population serotypic frequencies with amino acid sequences. For the 54 amino acid sites thought to have functional importance, the average heterozygosity per site is 0.301. Sixteen positions have heterozygosities greater than 0.5 at one or both loci and the frequencies of amino acids at a given position are very even, resulting in nearly the maximum heterozygosity possible. Furthermore, the high heterozygosity is concentrated in the peptide-interacting sites, whereas the sites that interact with the T-cell receptor have lower heterozygosity. Overall, these results indicate the importance of some form of balancing selection operating at HLA loci, maybe even at the individual amino acid level.lld:pubmed
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pubmed-article:2062867pubmed:articleTitleHeterozygosity at individual amino acid sites: extremely high levels for HLA-A and -B genes.lld:pubmed
pubmed-article:2062867pubmed:affiliationInstitute of Molecular Evolutionary Genetics, Pennsylvania State University, University Park 16802.lld:pubmed
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pubmed-article:2062867pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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