Fig. 2From: Marsupials and monotremes possess a novel family of MHC class I genes that is lost from the eutherian lineagePhylogeny of class Is predicted in representative species spanning the jawed vertebrates estimated by MCMC on the JTT + IG model. Numbers at nodes represent the frequency with which that split is observed. Gene families are labelled around the outside. The species label shows the location of classical MHC class I for each species or group of species. Key gene families or species’ classical class I genes are highlighted in colourBack to article page