Effects of MAK on the duration of immobility, climbing and swimming behaviors in the forced swimming test. Behaviors were scored every 5 s for a 5-min observation period. Results are the mean ± S.E.M. The number of rats per group was: control group, n = 8; MAK (0.3 g/kg)-treated group, n = 6; MAK (1 g/kg)-treated group, n = 6; imipramine-treated group, n = 5. *P < 0.05, **P < 0.01 compared with the control group, one-way analysis of variance followed by Tukey’s test.