The uncommon retina of the common house mouse

@article{Neitz2001TheUR,
  title={The uncommon retina of the common house mouse},
  author={Maureen Neitz and Jay Neitz},
  journal={Trends in Neurosciences},
  year={2001},
  volume={24},
  pages={248-249}
}
Unlike most mammals, most cones in house mouse retina express two opsins, one sensitive to UV-light, and another sensitive to middle-wavelengths. Is the mouse unique, having a single cone type that normally expresses two opsins? Or is the mouse a typical mammal having two cone types, but a species wide mutation results in co-expression of two opsins? 
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