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Red-sensitive opsin is a protein that in humans is encoded by the OPN1LW gene.
This gene encodes for a light absorbing visual pigment of the opsin gene family. The encoded protein is called red cone photopigment or long-wavelength sensitive opsin (LWS opsin or L opsin). Contrary to popular belief, the human red-sensitive opsin's peak response is not in the red region of the visual spectrum; its peak sensitivity is 560 nm, which corresponds to a "yellowish-green" color, i.e. between green (530 nm) and yellow (580 nm). Its name as the "red" opsin reflects the fact that it is more sensitive to red than the other two human opsins. The red opsin also has a secondary response in the violet high frequencies.