Fig. 5From: Molecular characterization of MHC class IIB genes of sympatric Neotropical cichlidsPhylogenetic tree showing trans-species polymorphisim of exons 2 and 3 of all MHC IIB alleles found in the Midas cichlid (in black) and 20 alleles from other species (in blue), with posterior probabilities. Alleles are grouped according to how they cluster in Fig. 4 Back to article page