Figure 2.
A role of R7BP in the locomotor activating actions of morphine. Knockout of R7BP increases sensitivity to the locomotor activating actions of morphine. In particular, R7BPKO mice show a significant locomotor activation at a dose of 5 mg/kg (a). Wild-type animals do not show activation at this dose (p<0.001 two-way ANOVA followed by Bonferroni test). At higher doses of morphine (10 and 20 mg/kg), locomotor activation starts much earlier in R7BPKO mice compared with their wild-type controls (b, c, p<0.001, followed by Bonferroni post hoc test). Data are expressed as mean±SEM, n=5–9 per group.