Fig. 2From: New data from basal Australian songbird lineages show that complex structure of MHC class II β genes has early evolutionary origins within passerinesRelationships of MHC class II β exon 2 sequences among basal passerine species. a Bayesian phylogeny of MHC alleles from the seven basal passerine species in this study, rooted with Crocodylus niloticus; asterisks denote major branches with posterior probabilities > 90 %, and pseudoalleles are indicated by arrows. b Neighbour-net of MHC class II β exon 2 sequences from seven basal passerine species. Sequences are colour coded by familyBack to article page