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| Description: Shown are autoradiographs of cross sections of brains of rats injected with radioactive 2-DG during the day (left) and the night (right). The dark region at the base of the brain (arrows) indicates increased metabolic activity of the suprachiasmatic nuclei. (From Schwartz, W. J., and Gainer, H. Science, 1977, 197, 1089–1091. Reprinted with permission.)
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