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phototransduction system

What intracellular second messenger is the primary regulator of the physiological response of photoreceptors to stimulus?

Ideas are then explained briefly.

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The phototransduction system is very different from most other types of neural signalling. In general, neurons depolarize when stimulated, however the photoreceptor cells go through hyperpolarization when stimulated by ...

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A definition of phototransduction system occurs.