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Fig. 2. Circadian pattern of wheel-running activity in control (C, open symbols)
and activity-selected mice (S, closed symbols) running spontaneously (circles)
or running for food (triangles). Each symbol plots the mean distance ran in
hourly bins (e.g. bin 12=from 12:00 until 13:00). Vertical bars are
inter-individual s.e.m. The black bar on top represents the dark phase.