Monoamine Oxidases and Their Selective Inhibition, Volume IV, documents the proceedings of the 3rd Congress of the Hungarian Pharmacological Society held in Budapest, 1979. The discovery of the selective monoamine oxidase (MAO) inhibitors, such as clorgyline and deprenyl, has given a new impetus to MAO research as well as to the clinical applicability of these compounds. This volume contains 21 papers by researchers and clinicians from eight different countries. It begins with papers on the pharmacological effects and the biochemical mode of actions of deprenyl as well as some other new selective inhibitors. This is followed by communications concerning the biochemical methods applied in the study of the nature of MAO in the mitochondrial membrane. Finally, the neurologists provide an account of their experience with the clinical application of deprenyl, and other inhibitors in Parkinsonian patients. They also discuss the essential role of the dopaminergic mechanism with respect to the disease.