The evolution of trichromatic color vision by opsin gene duplication in New World and Old World primates.

@article{Dulai1999TheEO,
  title={The evolution of trichromatic color vision by opsin gene duplication in New World and Old World primates.},
  author={Kanwaljit S. Dulai and M. von Dornum and John D. Mollon and David M. Hunt},
  journal={Genome research},
  year={1999},
  volume={9 7},
  pages={
          629-38
        }
}
Trichromacy in all Old World primates is dependent on separate X-linked MW and LW opsin genes that are organized into a head-to-tail tandem array flanked on the upstream side by a locus control region (LCR). The 5' regions of these two genes show homology for only the first 236 bp, although within this region, the differences are conserved in humans, chimpanzees, and two species of cercopithecoid monkeys. In contrast, most New World primates have only a single polymorphic X-linked opsin gene… 

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