Assertion: retina's type | /r/HasProperty | rod
Facets:
Source sentences:
text: The primary light-sensing cells in the retina are the photoreceptor cells, which are of two types: rods and cones.
text: There are two types of photoreceptor cells in the human eye — rods and cones.
text: There are currently three known types of photoreceptor cells in mammalian eyes: rods, cones, and intrinsically photosensitive retinal ganglion cells.