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A tadpole (Upper) and an adult (Lower) of American bullfrog Lithobates catesbeianus. Tadpoles are herbivorous living in the water, while adults are carnivorous living partly on land. Hao et al. (6) studied this species and found that tadpoles and adults employ different bitter taste receptor (Tas2r) gene repertoires to each other. Photo courtesy: Takahide Sasai.
