Linked from
The 38 pages that link to Photoreceptor cell, each with the reason it gives.
Compound eyeRelated: Photoreceptors inside ommatidia transduce incoming light into neural signals.
Optic nerveRelated: Photoreceptors begin the visual signal chain that ultimately reaches the nerve.
Alström syndromeRelated: Progressive photoreceptor degeneration drives the syndrome’s vision loss.
ChlamydomonasRelated: Photoreceptors in the eyespot system detect directional light.