Higgins, G A Effect of the 5-HT3 receptor antagonists, MDL72222 and ondansetron on morphine place conditioning. [electronic resource] - Psychopharmacology 1992 - 315-20 p. digital Publication Type: Comparative Study; Journal Article ISSN: 0033-3158 Standard No.: 10.1007/BF02245411 doi Subjects--Topical Terms: AnimalsConditioning, Operant--drug effectsDose-Response Relationship, DrugImidazoles--pharmacologyMaleMorphine--antagonists & inhibitorsOndansetronRatsRats, Inbred StrainsSerotonin Antagonists--pharmacologyTropanes--pharmacology