Photo-labile Pigments of the Chicken Retina

@article{Wald1937PhotolabilePO,
  title={Photo-labile Pigments of the Chicken Retina},
  author={George Wald},
  journal={Nature},
  year={1937},
  volume={140},
  pages={545-546}
}
THOUGH visual purples of the retinal rods have been known for sixty years1,2, nothing has been learned directly of analogous substances in the cones. In the chicken retina, which contains principally cones, attempts to identify photo-labile pigments heretofore have failed2. I have extracted from it two such pigments. 

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