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Mean ± SEM (A) robustness, (B) amplitude, and (C) acrophase of the circadian waveforms of 15 L (white bars/symbols), SD-NR (crosshatched bars/symbols) and SD-R (black bars/symbols) hamsters. (D) Mean ± SEM duration of nocturnal locomotor activity. *P≤0.05 and **P≤0.005 vs. SD-R value.
