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).

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).

Opsin 3, or OPN3, is a protein within the opsin family, which primarily allows animals to detect light. But OPN3 is a non-visual opsin, meaning its function is not related to the processing of light ...