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Gene tree of exons 4–8 of New World primate MHC class I sequences. The MHC class I processed pseudogene MHC-PS1 clusters with the expressed owl monkey MHC class I alleles. Test of significance of internal branches: ∗, P < 0.05; ∗∗, P < 0.01; ∗∗∗, P < 0.001.
