In 1966, Vittorio Erspamer, the editor of the first monograph within the Handbook of Experimental Pharmacology series that dealt with 5-hydroxy- tryptamine (Vol. XIX) wrote in the Preface: "In a decade of intense and dedicated work, an immense amount of experimental data has been collected, the significance of which ...has spread into all fields of biology and medi- cine ...". Three decades later, a dramatic further increase in our knowledge of all neuroscientific aspects of the serotoninergic system in the CNS has been achieved, and we are witnessing persisting interest in the biology of...