Willenbring, S Spinal mu, delta and kappa opioids alter chemical, mechanical and thermal sensitivities in amphibians. [electronic resource] - Life sciences 1997 - 2167-76 p. digital Publication Type: Journal Article; Research Support, U.S. Gov't, P.H.S. ISSN: 0024-3205 Standard No.: 10.1016/s0024-3205(97)00919-3 doi Subjects--Topical Terms: Analgesics, Opioid--pharmacologyAnimalsDrug InteractionsEnkephalin, Leucine-2-Alanine--pharmacologyFentanyl--pharmacologyInjections, SpinalMorphine--pharmacologyNaltrexone--pharmacologyNarcotic Antagonists--pharmacologyNociceptors--drug effectsPain Measurement--drug effectsPain Threshold--drug effectsRana pipiensReceptors, Opioid--drug effectsReceptors, Opioid, delta--drug effectsReceptors, Opioid, kappa--drug effectsReceptors, Opioid, mu--drug effectsSensitivity and SpecificitySpinal Cord--drug effects