The rat retina has five types of ganglion-cell photoreceptors

AN Reifler, AP Chervenak, ME Dolikian… - Experimental eye …, 2015 - Elsevier
Intrinsically photosensitive retinal ganglion cells (ipRGCs) are inner retinal photoreceptors
that mediate non-image-forming visual functions, eg pupillary constriction, regulation of
pineal melatonin release, and circadian photoentrainment. Five types of ipRGCs were
recently discovered in mouse, but whether they exist in other mammals remained unknown.
We report that the rat also has five types of ipRGCs, whose morphologies match those of
mouse ipRGCs; this is the first demonstration of all five cell types in a non-mouse species …