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Fig. 4. Hypothetical trajectories for the amount of voluntary wheel running across
a 6-day test period, as implemented in the selective breeding experiment with
house mice. (A,B) Examples of greater plasticity in the Selected lines (S;
black circles) than in the Control lines (C; gray squares). (C) Similar
relative increases in wheel running on a day-to-day basis, but greater
absolute increases in the S lines. See text for discussion.