Figure 2.

Distribution of PS sites on two protein structures. Modeled structure of Q6LR96 protein (3-hydroxydecanoyl-ACP dehydratase) and of Q6LLX4 (phosphoribosylamine-glycine ligase) coded respectively by P. profundum SS9 PBPRA1773 and PBPRA3420 genes. Sites showing evidence of positive selection (P < 0.01) are depicted as red spheres. From two different perspectives it appears that most of PS sites are located on the protein surface.