The 8th Camerino-Noordwijkerhout Symposium has continued along its traditional path of interdisciplinary cooperation. Chemists, biochemists, pharmacologists, biophysicists and physiologists are all involved in the task of improving our knowledge of the mechanisms of drug-receptor interaction and of the heterogeneous nature of biological molecules. In this volume, leading researchers have contributed state of the art information on receptor chemistry. Newest developments are covered with particular reference to receptors of the nervous system; SAR studies; receptor isolation; receptor cloning; receptor topography; biomedical consequences of occupancy; receptor regulation and receptor theory. This will be of great interest to pharmacologists, biochemists and medicinal chemists, as well as a valuable source of reference for medical students and postgraduate students in related fields.