retinoid binding retinal binding retinaldehyde binding molecular_function violet-sensitive opsin long-wave-sensitive opsin blue-sensitive opsin Binding to retinal, one of the forms of vitamin A. Retinal plays an important role in the visual process in most vertebrates, combining with opsins to form visual pigments in the retina. red-sensitive opsin GO:0016918 vitamin A binding short-wave-sensitive opsin opsin UV-sensitive opsin green-sensitive opsin vitamin binding