Fig. 3

Methamphetamine (MA)-induced CPP in mice. A Baseline phase: Mice have no intrinsic preference for L and R compartments. B Testing phase: Mice produce place preference for MA administration compartment (R). C There was no statistical difference in the place preference of the MA administration compartment (R) between mice in the E-MA and N-MA group. L: left compartment.; R: right compartment; ** P <0.01, A highly significant statistical difference was observed