chapter 1 History of Delta Receptors / chapter 2 Cloning of Delta Opioid Receptors / chapter 3 Cloning and Expression of the Human Delta Opioid Receptor -- chapter 4 In Vitro and In Vivo Mutagenesis: Insights into Delta Receptor Structure and Function -- chapter 5 Delta Opioid Receptor Signaling and Trafficking / chapter 6 Delta Opioid Receptors and G Proteins / chapter 7 Transcriptional Regulation of Delta Opioid Receptor Gene / chapter 8 Benzhydrylpiperazines as Nonpeptidic Delta Opioid Receptor Ligands / chapter 9 Delta-Selective Ligands Related to Naltrindole / chapter 10 Endogenous Peptides for Delta Opioid Receptors and Analogues / chapter 11 Deltorphins / chapter 12 Opioid Peptide-Derived Delta Antagonists, Inverse Delta Agonists, and Mixed Mu Agonist/Delta Antagonists -- chapter 13 Inverse Agonism at the Delta Opioid Receptors -- chapter 14 Mixed Opioid Receptor Agonists as a New Class of Agents for the Treatment of Moderate to Severe Pain -- chapter 15 Biphalin: A Multireceptor Opioid Ligand -- chapter 16 Binding and Activity of Opioid Ligands at the Cloned Human Delta, Mu, and Kappa Receptors -- chapter 17 Inhibitors of Enkephalin-Inactivating Enzymes and Delta Opioid Responses / chapter 18 The Delta Opioid Receptor Subtypes and Pain Modulation / chapter 19 Delta Opioid Receptor-Mediated Antinociception/ Analgesia -- chapter 20 Antidepressant-like Effects of Delta Opioid Receptor Agonists / chapter 21 Mu-Delta Interactions In Vitro and In Vivo / chapter 22 Delta Opioids and Immune Function / chapter 23 Delta Opioids and Substance Abuse / chapter 24 Delta Opioid Receptors in the Gastrointestinal Tract / chapter 25 Cardioprotection and Delta Opioid Receptors / chapter 26 The Delta Opioid Receptor and Brain Pain�Modulating Circuits.