Photopsin

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

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  Three-dimensional structure of bovine rhodopsin. The seven transmembrane domains are shown in varying colors. The retinal chromophore is shown in red.

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  Normalised absorption spectra of the three human photopsins and of human rhodopsin (dashed). Drawn after Bowmaker and Dartnall (1980).