Analysis on mechanisms that enable cone photoreceptor cells to work under continuous light conditions.

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In vertebrate retina, there are two types of visual photoreceptor cells, called rods and cones. Rods mediate night vision, and cones mediate daytime vision. It is well known cones. Rods mediate night vision, and cones mediate daytime vision. It is well known bright conditions where cones receive light stimuli continuously. In this study, we found that, in cones,(1) the efficiency of the inactivation of visual pigments by phosphorylation is strongly modulated, and(2) phosphorylated visual pigments are dephosphorylated rapidly. These mechanisms seem to enable cones to generate responses under bright conditions.