How photons start vision.

  title={How photons start vision.},
  author={D A Baylor},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  volume={93 2},
  • D A Baylor
  • Published 1996 in
    Proceedings of the National Academy of Sciences…
Recent studies have elucidated how the absorption of a photon in a rod or cone cell leads to the generation of the amplified neural signal that is transmitted to higher-order visual neurons. Photoexcited visual pigment activates the GTP-binding protein transducin, which in turn stimulates cGMP phosphodiesterase. This enzyme hydrolyzes cGMP, allowing cGMP-gated cationic channels in the surface membrane to close, hyperpolarize the cell, and modulate transmitter release at the synaptic terminal… CONTINUE READING
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