Bayesian phylogenetic tree based on introns 1–8 from primate MHC class I genes and pseudogenes.

<p>Black dots at the branching points indicate a support with a posterior probability greater than 0.9. A phi (Ψ) symbol in front of a sequence name indicates pseudogene and a question mark (?) indicates an incompletely sequenced gene. Catarrhini clades include human and Rhesus monkey MHC class I sequences, whereas MHC class I sequences from the grey mouse lemur <i>Microcebus murinus</i> (Mimu) were used as outgroup. Lineages are indicated by a G (<i>MHC-G-like</i>) or a B (<i>MHC-B</i>), followed by a Roman number. Caja, <i>Callitrhix jacchus</i>; Sabo, <i>Saimiri boliviensis</i>; Sasc, <i>Saimiri sciureus</i>; Camo, <i>Callicebus moloch</i>; Atge, <i>Ateles geoffroyi</i>; Saoe, <i>Saguinus oedipus</i>; Aotr, <i>Aotus trivirgatus</i>. Accession numbers for published Platyrrhini MHC class I sequences used in the analysis are listed in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0131343#pone.0131343.s004" target="_blank">S3 Table</a>.