Melanopsin (Opn4) positive cells in the cat retina are randomly distributed across the ganglion cell layer.


A rare type of rodent retinal ganglion cell expresses melanopsin (Opn4), the majority of which project to the suprachiasmatic nuclei. Many of these cells are directly light sensitive and appear to regulate the circadian system in the absence of rod and cone photoreceptors. However, the rodent retina contains no overt regions of specialization, and the… (More)


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