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(A) Locomotor activity (in seconds) and (B) number of rearings after METH withdrawal in the control (n = 20), limited-access (n = 12) and extended-access (n = 15) groups. The extended-access group exhibited (A) less locomotion and (B) less rearing compared with the limited-access and control groups (**P < 0.05). The data are expressed as mean ± SEM.
