Fig. 1From: An annual cycle of gene regulation in the red-legged salamander mental gland: from hypertrophy to expression of rapidly evolving pheromonesMental gland hypertrophication. Comparison of male P. shermani from (a) late May (non-breeding condition) and (b) mid-August (breeding condition), with the mental gland being the large pad-like structure on the male’s lower jaw in panel bBack to article page