Photosensitivity of the Circadian Rhythm and of Visual Receptors in Carotenoid-Depleted Drosophila

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Science  19 Mar 1971:
Vol. 171, Issue 3976, pp. 1167-1169
DOI: 10.1126/science.171.3976.1167


Drosophila melanogaster was raised on aseptic diets, with and without β-carotene. The sensitivity of visual receptors in the carotenoid-depleted flies was lowered 3 log units, but the photosensitivity of the circadian rhythm was not affected. This result suggests that the chromophore of the photopigment which mediates light effects on the circadian rhythm is not a carotenoid derivative.