title: Reply to the letter by J.L. Plummer.
authors.affiliation: Department of Physiological Nursing University of California San Francisco, CA 94913, USA Departments of Anatomy, Medicine, and Oral Surgery Graduate Group in Neuroscience University of California San Francisco, CA 94913, USA.
authors.forename: Christine
authors.initials: C
authors.lastname: Miaskowski
authors.forename: Jon D
authors.initials: JD
authors.lastname: Levine
mesh_terms: D000700:Analgesics / Q000494:pharmacology*; D000704:Analysis of Variance; D004357:Drug Synergism; D011957:Receptors, Opioid / Q000187:drug effects*
chemical_list: D000700:Analgesics; D011957:Receptors, Opioid