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Confirmation of the successful suprachiasmatic nucleus (SCN) lesion. (A) Sham-operated mice: Substantial circadian rhythms in the heart rate and body temperature were observed. (B) SCN-lesioned mice: The arrow indicates the date that the SCN was lesioned. The SCN lesion was considered successful if the loss of circadian rhythms of heart rate and body temperature persisted for more than 14 days.
