Abstract
Vertebrate visual cells represent a system in an extraordinarily dynamic state. Major parts of the photoreceptors are continually degraded and resynthesized, thus, the cell's morphological and functional integrity is maintained. Some components of visual cell renewal processes follow an endogenous, circadian rhythm driven by an ocular oscillator. Regulative mechanisms of these circadian rhythms may comprise interactions between the neurohormone melatonin and the putative retinal neurotransmitter and neuromodulator dopamine.
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