Photoreceptor

Overview
Photoreceptor can refer to:

In anatomy/cell biology:
 * Photoreceptor cell: a photosensitive cell, most commonly referring to a specialized type of neuron found in the retina of vertebrate eyes that is capable of phototransduction;
 * Ocellus (invertebrate photoreceptor): a photoreceptor organ ("simple eye") of invertebrates often comprised of a few sensory cells and a single lens;
 * Eyespot apparatus (microbial photoreceptor): the photoreceptor organelle of a unicellular organism that allows for phototaxis.

In biochemistry:
 * Photoreceptor protein: a chromoprotein that responds to being exposed to a certain wavelength of light by initiating a signal transduction cascade;
 * Photopigment: an unstable pigment that undergoes a physical or chemical change upon absorbing a particular wavelength of light; also see:
 * Photosynthetic pigment: molecules involved in transducing light into chemical energy.

In technology:
 * Photodetector or photosensor: a device that detects light by capturing photons

Photorécepteur