Is retinal present in all visual photopigments?
Retinal is also known as retinaldehyde. It was originally called retinene,and renamed after it was discovered to be vitamin A aldehyde.Retinal is one of the many forms of vitamin A (the number of which varies from species to species). Retinal is a polyene chromophore, bound to proteins called opsins, and is the chemical basis of animal vision. Retinal allows certain microorganisms to convert light into metabolic energy.
@sunitasaxena Is retinal present in all visual photopigments?
term photopigment is applied to opsin-type photoreceptor proteins, specifically rhodopsin and photopsins, the photoreceptor proteins in the retinal rods and cones of vertebrates that are responsible for visual perception, but also melanopsin and others.
A cone uses opsin photopigments for blue, green, and red, as well as all-cis retinal; these cone pigments permit color vision