Early opsin expression in Xenopus embryos precedes photoreceptor differentiation.

@article{Saha1993EarlyOE,
  title={Early opsin expression in Xenopus embryos precedes photoreceptor differentiation.},
  author={Margaret S Saha and Robert M. Grainger},
  journal={Brain research. Molecular brain research},
  year={1993},
  volume={17 3-4},
  pages={
          307-18
        }
}
The visual pigment which serves as the first step in the phototransduction cycle in vertebrate rod cells consists of a retinal chromophore which is linked to the transmembrane protein, opsin. Opsin genes have been isolated from a number of different organisms and studies have shown opsin to be developmentally regulated with both mRNA and protein expression associated with the morphological differentiation of photoreceptor cells. Due to its potential utility as a marker for rod photoreceptor… CONTINUE READING

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