Opsins

**Definition:** Photosensitive proteins in the membranes of PHOTORECEPTOR CELLS such as the rods and the cones. Opsins have varied light absorption properties and are members of the G-PROTEIN-COUPLED RECEPTORS family. Their ligands are VITAMIN A-based chromophores.

**Tree numbers:** - D12.776.306.466 - D23.767.930.750

**Synonyms:** - Opsin