Diversifying and purifying selection in the peptide binding region of DRB in mammals.

Abstract excerpt

The class II genes of the major histocompatibility complex encode proteins which play a crucial role in antigen presentation. They are among the most polymorphic proteins known, and this polymorphism is thought to be the result of natural selection. To understand the selective pressure acting on the protein and to examine possible differences in the evolutionary dynamics among species, we apply maximum likelihood...

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