Figure 2

Dark-field photomicrograph of a section of hamster brain which has been immunocytochemically stained for the peptide vasoactive intestinal peptide. Core questions for the field of circadian rhythms include: (1) what are the cellular/molecular mechanisms which allow these cells to form functional circadian oscillators? (2) how does environment regulate this oscillator? and (3) how are these cells coupled to the various processes under their control?

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published 2000