Melanopsin; Photoreceptor required for regulation of circadian rhythm. Contributes to pupillar reflex and other non-image forming responses to light. May be able to isomerize covalently bound all- trans retinal back to 11-cis retinal (By similarity); Belongs to the G-protein coupled receptor 1 family. Opsin subfamily.
Synonyms: OPN4, OPN4p, hOPN4, C9JWU6, Q9UHM6 ...