Physiological correlates of multiple subtypes of enteric opiate receptor; functional analysis of myenteric delta receptors.

Animals Dose-Response Relationship, Drug Enkephalin, Leucine-2-Alanine Enkephalin, Methionine/analogs & derivatives Enkephalins/pharmacology Guinea Pigs Ileum/innervation Morphine/pharmacology Morphine Derivatives/pharmacology Myenteric Plexus/drug effects,physiology Receptors, Opioid/drug effects,physiology Receptors, Opioid, delta

Enkephalins Morphine Derivatives Receptors, Opioid Receptors, Opioid, delta Enkephalin, Methionine enkephalin, Met(2)-ProNH2(5)- Enkephalin, Leucine-2-Alanine Morphine normorphine