Brain serotonin neurotransmission: an overview and update with an emphasis on serotonin subsystem heterogeneity, multiple receptors, interactions with other neurotransmitter systems, and consequent implications for understanding the actions of serotonergic drugs - Murphy,D.L.; Anndrews,A.M.; Wichems,C.H.; Li,Q.; Tohda,M.; Greenberg,B. (J Clin Psychiatry, 1998)