Photopsin
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Photopsins are chemical proteins within the cone cell receptors of the eyes. They recognize colors. They are also known as iodopsins. Rod cells have other opsins.
Photopsin Media
Three-dimensional structure of bovine rhodopsin. The seven transmembrane domains are shown in varying colors. The retinal chromophore is shown in red.
Normalised absorption spectra of the three human photopsins and of human rhodopsin (dashed). Drawn after Bowmaker and Dartnall (1980). (Absorption curves do not directly reflect sensitivity spectra.)
