@article {Quock503, author = {Raymond M. Quock and Thomas H. Burkey and Eva Varga and Yoshiaki Hosohata and Keiko Hosohata and Scott M. Cowell and Cheryl A. Slate and Frederick J. Ehlert and William R. Roeske and Henry I. Yamamura}, title = {The δ-Opioid Receptor: Molecular Pharmacology, Signal Transduction, and the Determination of Drug Efficacy}, volume = {51}, number = {3}, pages = {503--532}, year = {1999}, publisher = {American Society for Pharmacology and Experimental Therapeutics}, issn = {0031-6997}, URL = {https://pharmrev.aspetjournals.org/content/51/3/503}, eprint = {https://pharmrev.aspetjournals.org/content/51/3/503.full.pdf}, journal = {Pharmacological Reviews} }