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Study reveals opsin 3’s role in mouse appetite control

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OPN3 expressing neurons (green) in the paraventricular nucleus of the hypothalamus. Image courtesy of Jonathan Mercado-Reyes. Credit: Jonathan Mercado-Reyes.

Scientists discovered years ago that the hypothalamus—which helps to manage body temperature, hunger, sex drive, sleep and more—includes neurons that express the protein opsin 3 (OPN3). Far less clear, however, was what this…

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