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The rhodopsin divides into retinene and opsin.

When this mixture is placed in the dark, the enzymes convert the vitamin A to retinene, a yellow pigment.

Then the retinene combines with the opsin to form bright red rhodopsin.

The retinene reverts to vitamin A. This is just what happens when light shines into a dark-adapted eye: the rhodopsin in the rods is suddenly decomposed.