| photoreceptors | Cells specialised to detect and transduce light and darkness. Rods and cones are the photoreceptors in the vertebrate retina. (12 Dec 1998) |
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| photoreceptors, invertebrate | Cells in invertebrates which are specialised to detect and transduce light and darkness and relay that information centrally in the nervous system. (12 Dec 1998) |