Rhodopsin molecule. Computer model showing the structure of a molecule of the rhodopsin complex. Rhodopsin (also called visual purple) is a pigment found in the rod photoreceptor cells in the retina of the eye, where it absorbs light falling on the retina. The rhodopsin complex consists of the protein opsin (blue), bound to a non-protein component, retinal (orange). The retinal molecule absorbs light, which causes it to change shape and separate from the opsin. This initiates the transmission of nerve impulses to the brain, leading to the sensation of vision. The great sensitivity of rhodopsin is what allows vision in dim light.
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