This study also found that Kv4.2 KO mice showed increased immobility in the forced-swim test (FST) (but not the tail-suspension test) for 'depression-related' behavior, and were insensitive to the anti-immobility effects of the antidepressant fluoxetine, but not imipramine or desipramine, in the FST. This evidence concerns the gene KCND2 and major depressive disorder.