Neither functional rod photoreceptors nor rod or cone outer segments are required for the photic inhibition of pineal melatonin.

Abstract excerpt

Pineal melatonin production is rapidly suppressed by light. In mammals, the photoreceptors mediating this response are ocular; however, definitive information regarding their nature and precise location is absent. In an attempt to define these photoreceptors, we examined the sensitivity of pineal melatonin production to inhibition by controlled irradiance monochromatic green light (lambda max 509 nm) in C3H mice...

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