Evolutionary transformation of rod photoreceptors in the all-cone retina of a diurnal garter snake.

@article{Schott2016EvolutionaryTO,
  title={Evolutionary transformation of rod photoreceptors in the all-cone retina of a diurnal garter snake.},
  author={Ryan K. Schott and Johannes M{\"u}ller and Clement G. Y. Yang and Nihar Bhattacharyya and Natalie Pei Xin Chan and Mengshu Xu and James M. Morrow and Ana-Hermina Ghenu and Ellis R. Loew and Vincent Tropepe and Belinda S. W. Chang},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={2016},
  volume={113 2},
  pages={
          356-61
        }
}
Vertebrate retinas are generally composed of rod (dim-light) and cone (bright-light) photoreceptors with distinct morphologies that evolved as adaptations to nocturnal/crepuscular and diurnal light environments. Over 70 years ago, the "transmutation" theory was proposed to explain some of the rare exceptions in which a photoreceptor type is missing, suggesting that photoreceptors could evolutionarily transition between cell types. Although studies have shown support for this theory in nocturnal… CONTINUE READING

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Visual Pigments, Ocular Filters and the Evolution of Snake Vision.

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