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Mean ±SEM free-running period lengths of wild-type (+/ +) and heterozygote (+ /−) Gsk3β knockout mice. Different letters above bars denote significant differences between groups (P<0.05). The τ of Gsk3β+/− mice during weeks 6 and 7 of methamphetamine (MAP) treatment were highly variable and the mean did not differ significantly from any other group.
