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A photoreceptor molecule (panopsin, opsin3), homologous to vertebrate retinal and pineal opsins, found primarily in the brain, not the retina, that may play a role in nonvisual but light-dependent processes such as the entrainment of circadian rhythms or the regulation of pineal melatonin production. See opsin (opsin subfamilies).

Subjects: Medicine and Health.

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