Ultraviolet visual pigment in a vertebrate: a tetrachromatic cone system in the dace

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Science  02 Dec 1983:
Vol. 222, Issue 4627, pp. 1021-1023
DOI: 10.1126/science.6648514


Microspectrophotometric measurements of optically isolated photoreceptors in the Japanese dace, a cyprinid fish, revealed four spectroscopically distinguishable cone pigments and one rod pigment. A visual pigment that absorbs in the near ultraviolet was found in small single cones.

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