Negus, S S <br/><br/>
Modulation of delta opioid agonist-induced antinociception by repeated morphine pretreatment in rhesus monkeys.  [electronic resource] 

 -  Life sciences  Mar 2010 
 - 385-92 p.  digital 
<br/><br/> Publication Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, N.I.H., Intramural 
<br/><br/><label>ISSN: </label>1879-0631 
<br/><br/><label>Standard No.: </label>10.1016/j.lfs.2010.01.006  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Analgesics, Opioid--administration & dosage<br/>Animals<br/>Behavior, Animal--drug effects<br/>Benzamides--pharmacology<br/>Conditioning, Operant--drug effects<br/>Dose-Response Relationship, Drug<br/>Fentanyl--pharmacology<br/>Food<br/>Hot Temperature<br/>Macaca mulatta<br/>Male<br/>Morphine--administration & dosage<br/>Piperazines--pharmacology<br/>Receptors, Opioid, delta--agonists<br/>Receptors, Opioid, mu--agonists<br/>Reinforcement Schedule