It has been known for half a century that neurotransmitters are released in preformed quanta, that the quanta represent transmitter-storing vesicles, and that release occurs by exocytosis. The focus of this book is twofold. In the first part, the molecular events of exocytosis are analysed. This includes a discussion of presynaptic calcium channels, the core proteins of the secretory machinery, and the actions of clostridial toxins and a -latrotoxin, famous for their potency as well as their crucial role in the elucidation of the steps of exocytosis. In the book's second part, the...