Valproic acid effect on movements in the tail suspension test. Small and strong movements in AU were measured 30 min following ip treatment with saline and valproic acid (VPA) 100 mg/kg and 300 mg/kg. Treatments were dispensed at 15 days intervals. ** P < 0.01 WT vs. KO, Bonferroni post hoc. WT n = 6, KO n = 8.