Ancient colour vision: multiple opsin genes in the ancestral vertebrates

@article{Collin2003AncientCV,
  title={Ancient colour vision: multiple opsin genes in the ancestral vertebrates},
  author={Shaun P. Collin and M. A. Knight and Wayne I L Davies and Ian C. Potter and David M. Hunt and Ann E. O. Trezise},
  journal={Current Biology},
  year={2003},
  volume={13},
  pages={R864-R865}
}

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