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Science 15 April 1977:
Vol. 196. no. 4287, pp. 305 - 307
DOI: 10.1126/science.557840
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Articles

Science, Vol 196, Issue 4287, 305-307
Copyright © 1977 by American Association for the Advancement of Science

articles

Estradiol shortens the period of hamster circadian rhythms

LP Morin, KM Fitzgerald, and I Zucker

Continuous administration of estradiol benzoate by means of subcutaneously implanted capsules shortened the free-running circadian period of locomotor activity of blind hamsters (Mesocricetus auratus) that had had their ovaries removed. Estradiol also advanced the phase of the wheel running of sighted female hamsters without ovaries that were entrained to a photoperiod with 12 hours of light and 12 of darkness. These results, and findings from hamsters undergoing natural estrous cycles, indicate that endogenous estradiol is involved in the regulation of circadian periodicity.


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