frogs (IMAGE)
Caption
A new study led by a Penn State biologist reveals that frogs have maintained a surprising number of nonvisual light-sensing proteins over evolutionary time. These proteins, called opsins, play a role in a variety of biological functions including calibration of circadian rhythm, melatonin release, pupil response, and detection and response to seasonal changes.
Credit
John L. Boyette/Penn State
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License
CC BY-NC-ND