This comes not directly from the visual cycle but from several retinal pools of retinal binding proteins which are connected to each other by the transportation and reaction steps of the visual cycle. ![]() In the transition from darkness to light suddenly, large amount of 11-cis retinal is required. Basically vision at low light intensities requires a lower turn-over rate of the visual cycle whereas during light the turn-over rate is much higher. For this, functional aspects come into play: the storage of retinal and the adaption of the reaction speed.
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