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Example of fluorescing 3–OHK pigment on a H. erato butterfly under a hand–held 365 nm LED light.

Ultraviolet and yellow reflectance but not fluorescence is important for visual discrimination of conspecifics by Heliconius erato

Susan D. Finkbeiner, Dmitry A. Fishman, Daniel Osorio, and Adriana D. Briscoe

Journal of Experimental Biology 2017. 220:1267-1276; doi: 10.1242/jeb.153593

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