Neuropeptides and Autoregulatory Immune Processes.- Role of Neuropeptides in the Bidirectional Communication Between the Immune and Neuroendocrine Systems.- Corticotropin and Immunoregulation.- ?-Melanotropin and its Role in Regulating the Inflammatory Response.- Immunoregulation by Neuropeptides Other than Corticotropin and Melanotropin.- Enkephalins as Regulators of Inflammatory Immune Reactions.- Interactions of Neuropeptides and Cytokines.- Stress and Immunity.- Pharmacological and Binding Evidence for Opioid Receptors on Vertebrate and Invertebrate Blood Cells.- Degradation of Neuropeptide Signal Molecules in Immunocytes of Vertebrates and Invertebrates.