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Photoreceptor

(Science: cell biology) A specialised cell type in a multicellular organism that is sensitive to light. This definition excludes single celled organisms, but includes noneye receptors, such as snake infra red (heat) detectors or photosensitive pineal gland cells.

See: retinal rods, retinal cones. Structures or pigments that react when light is present (as a [[stimulus).