"[The] study showed that low dose L-arginine is protective against MM induced depression as it could turn behavioral immobility (BI) to normal levels in groups taking MM plus L-Arginine, while in group taking just MM, BI was much longer showing the intensity of depression. L-Name and 7-NI did aggravated depression in MM groups but not control ones, on the other hand just in the case of 7-NI the result was significant." (Quoted from paper)