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Science 14 February 1969:
Vol. 163. no. 3868, pp. 688 - 689
DOI: 10.1126/science.163.3868.688
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Articles

Action Spectra for Phase Shifts of a Circadiain Rhythm in Drosophila

Kenneth D. Frank 1 and William F. Zimmerman 1

1 Department of Biology, Amherst College, Amherst, Massachusetts 01002

Action spectra were determined for lightinduced phase shifts of the circadian rhythm of adult emergence in Drosophila pseudoobscura. The action spectra for advance and delay phase shifts are similar; the most effective wavelengths are in the blue region, with a sharp cutoff above 500 nanometers. This similarity suggests that the same photoreceptive pigment mediates both advance and delay phase shifts.


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