The hummingbird T1R1–T1R3 receptor mediates the response to sweet tastes, having evolved from the T1R1–T1R3 receptor for amino acids. (From P. Jiang, G.K. Beauchamp, SCIENCE 345:878 (2014). ILLUSTRATION: V. ALTOUNIAN/SCIENCE.)

The hummingbird T1R1–T1R3 receptor mediates the response to sweet tastes, having evolved from the T1R1–T1R3 receptor for amino acids. (From P. Jiang, G.K. Beauchamp, SCIENCE 345:878 (2014). ILLUSTRATION: V. ALTOUNIAN/SCIENCE.)

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