Fig. 4From: The major histocompatibility complex in Old World camelids and low polymorphism of its class II genesEvolutionary trees of a DRA exon 2 (sum of branch length = 0.12597149), b DRB exon 2 (sum of branch length = 0.28248445) and c DQA exon 2 in camelids (sum of branch length = 0.25550596). Bootstrap support is shown for each node as a percentage based upon 1000 replicatesBack to article page