Posttranslational Processing of Peptide Precursors to Fragments.- Peptides.- Immunocytochemical Techniques in Peptide Localization.- In Vivo and In Vitro Studies on Peptide Release.- Functional Identification of Peptide Receptors.- Identification of Neuropeptide Receptors.- Biochemical Approaches to the Study of Peptide Actions.- Behavioral Tests.- Integrative Physiological Studies of Peptides in the Central Nervous System.- In Vivo Electrophysiological Techniques in the Study of Peptidergic Neurons and Actions.- In Vitro Preparations for Electrophysiological Study of Peptide Neurons and Actions.- Molluscan Model Systems for the Study of Neuropeptides.