Effects of bupropion on immobility (A) and climbing (B) behavior in the FST in α6 KO mice and their WT littermates. After 30 min bupropion (3 and 10 mg/kg, s.c.) or vehicle (saline) injection, mice were exposed to the FST. Results are expressed as the mean ± S.E.M of 11 (WT) and 9 (KO) mice. * p < 0.05, significantly different from vehicle treated WT group; + p < 0.05, significantly different from vehicle treated KO group; # p < 0.05, significantly different from its corresponding control group (KO vs WT group). Bup: bupropion