Intrinsically photosensitive retinal ganglion cells (ipRGCs) contain melanopsin. The ipRGCs, with their amazing long processes, are involved in the perception of light and dark and are circadian rhythm determinants.
Anti-Melanopsin staining on either flat-mount or cross-section staining of mouse retina.

Melanopsin Products:
Melanopsin Rabbit Polyclonal (Cat. #AB-N38)
Melanopsin Rabbit Polyclonal, affinity purified (Cat. #AB-N39)