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Sison-Mangus, Marilou S. and Briscoe, Adriana D. and Zaccardi, Guillermo and Knüttel, Helge and Kelber, Almut (2008) The lycaenid butterfly Polyommatus icarus uses a duplicated blue opsin to see green. The Journal of Experimental Biology (JEB) 211 (3), pp. 361-369.