title: Descending modulation in persistent pain: an update.
authors.affiliation: Department of Oral and Craniofacial Biological Sciences, Program in Neuroscience, University of Maryland Dental School, 666 West Baltimore Street, Room 5A12, Baltimore, MD 21201, USA.
authors.forename: Ke
authors.initials: K
authors.lastname: Ren
authors.forename: Ronald
authors.initials: R
authors.lastname: Dubner
mesh_terms: D006801:Humans; D008526:Medulla Oblongata / Q000166:cytology / Q000502:physiology*; D009434:Neural Pathways / Q000502:physiology*; D010146:Pain / Q000503:physiopathology*; D010487:Periaqueductal Gray / Q000166:cytology / Q000502:physiology*; D013116:Spinal Cord / Q000166:cytology / Q000502:physiology*