title: Photoreceptor
text: # Photoreceptor
  
  Photoreceptor can refer to:
  
  In anatomy/cell biology:
  
  * Photoreceptor cell, a photosensitive cell in the retina of vertebrate eyes
  * Simple eye in invertebrates (Ocellus), photoreceptor organ ("simple eye") of invertebrates often composed 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:
  
  