Figure 4From: The two tryptophans of β2-microglobulin have distinct roles in function and folding and might represent two independent responses to evolutionary pressureGene tree built using the Bayesian Inference method with MrBayes 3.1.2. The main taxonomic groups are highlighted. Amino acids at positions 96 and 137 in the multiple alignments are indicated; the group characterized by Trp and Leu is indicated.Back to article page