title: Guanine nucleotides differentiate agonist and antagonist interactions with opiate receptors.
mesh_terms: D000818:Animals; D006150:Guanine Nucleotides / Q000494:pharmacology*; D066298:In Vitro Techniques; D009292:Narcotic Antagonists / Q000378:metabolism*; D009294:Narcotics / Q000378:metabolism*; D051381:Rats; D011957:Receptors, Opioid / Q000187:drug effects* / Q000378:metabolism
chemical_list: D006150:Guanine Nucleotides; D009292:Narcotic Antagonists; D009294:Narcotics; D011957:Receptors, Opioid