The lycaenid butterfly Polyommatus icarus uses a duplicated blue opsin to see green.

  title={The lycaenid butterfly Polyommatus icarus uses a duplicated blue opsin to see green.},
  author={Marilou P Sison-Mangus and Adriana D Briscoe and Guillermo Zaccardi and Helge Kn{\"u}ttel and Almut Kelber},
  journal={The Journal of experimental biology},
  volume={211 Pt 3},
The functional significance of gene duplication is rarely addressed at the level of animal behavior. Butterflies are excellent models in this regard because they can be trained and the use of their opsin-based visual pigments in color vision can be assessed. In the present study, we demonstrate that the lycaenid Polyommatus icarus uses its duplicate blue (B2) opsin, BRh2, in conjunction with its long-wavelength (LW) opsin, LWRh, to see color in the green part of the light spectrum extending up… CONTINUE READING

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