title: Morphine and related compounds: evidence that they decrease available neurotransmitter in Aplysia californica.
mesh_terms: D000109:Acetylcholine / Q000008:administration & dosage / Q000378:metabolism* / Q000494:pharmacology; D000818:Animals; D003864:Depression, Chemical; D003915:Dextromethorphan / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D004347:Drug Interactions; D005724:Ganglia / Q000187:drug effects*; D007478:Iontophoresis; D007981:Levorphanol / Q000494:pharmacology; D008564:Membrane Potentials / Q000187:drug effects; D008974:Mollusca / Q000187:drug effects*; D009020:Morphine / Q000494:pharmacology*; D009270:Naloxone / Q000494:pharmacology; D009388:Neostigmine / Q000494:pharmacology; D009474:Neurons / Q000187:drug effects; D013329:Structure-Activity Relationship; D009435:Synaptic Transmission / Q000187:drug effects*
chemical_list: D007981:Levorphanol; D009270:Naloxone; D009388:Neostigmine; D003915:Dextromethorphan; D009020:Morphine; D000109:Acetylcholine