Trichromatic colour vision in New World monkeys

@article{Jacobs1996TrichromaticCV,
  title={Trichromatic colour vision in New World monkeys},
  author={Gerald H. Jacobs and Maureen Neitz and Jess F. Deegan and Jay Neitz},
  journal={Nature},
  year={1996},
  volume={382},
  pages={156-158}
}
TRICHROMATIC colour vision depends on the presence of three types of cone photopigment. Trichromacy is the norm for all Old World monkeys, apes and humans, but in several genera of New World monkeys, colour vision is strikingly polymorphic1. The difference in colour vision between these New and Old World primates results from differing arrangements of the pigment genes on the X chromosome. In Old World primates the three photopigments required for routine trichromatic colour vision are encoded… 
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The fact that the red/green opsin gene has survived the long nocturnal stage of mammalian evolution and that it is under strong purifying selection in organisms that live in dark environments suggests that this gene has another important function in addition to color vision, probably the control of circadian rhythms.
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