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Motor activity in monkeys maintained on CR compared with controls (CON) before and after exposure to the neurotoxin MPTP. Mean distance moved within the cage (A) and mean speed of movement (B) did not differ significantly between diet groups before MPTP treatment but were significantly higher in CR monkeys compared with CON monkeys after MPTP treatment. Values are the means and SEM. *, P < 0.05 compared with CON after MPTP, two-tailed, unpaired t test with Welch's correction.
