List of Contents.- Inducible Nitric Oxide Synthase: Regulation Subserves Function.- Diffusible Messengers and Intercellular Signaling: Locally Distributed Synaptic Potentiation in the Hippocampus.- Nitric Oxide Formation in the Vascular Wall: Regulation and Functional Implications.- S-Nitrosothiols and the Bioregulatory Actions of Nitrogen Oxides Through Reactions with Thiol Groups.- A New Nitric Oxide Scavenger, Imidazolineoxyl N-Oxide Derivative, and Its Effects in Pathophysiology and Microbiology.- The Role of Nitric Oxide in the Pathogenesis of Virus-Induced Encephalopathies.- The Role of Peroxynitrite in Nitric Oxide-Mediated Toxicity.- Regulation and Dysregulation of Constitutive Nitric Oxide Synthases Types I and III.