Selection for antimicrobial peptide diversity in frogs leads to gene duplication and low allelic variation.

Abstract excerpt

Antimicrobial peptides are highly diverse pathogen-killing molecules. In many taxa, their evolution is characterized by positive selection and frequent gene duplication. It has been proposed that genes encoding antimicrobial peptides might be subject to balancing selection and/or an enhanced mutation rate, but these hypotheses have not been well evaluated because allelic variation has rarely been studied at...

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