<prompt> Nitric Oxide NO is a novel neurotransmitter which is condidered to have an effect in the pathophysiology of which of the folowing psychiatric conditions?Substance MisuseMood DisordersSchizophreniaOCD  <response>: Nitric oxide is a neuro transmitter, in the gaseous for which is considered to have an effect in mood disorders. NOS expressing neurons are well represented in the areas implicated in depression. SSRIs is thought to directly inhibit NOS activity. Ref: Kaplan and Sadock, 10th Edition. 