title: Differences in synaptic effectiveness at frog neuromuscular junctions: evidence for long-term physiological regulation.
mesh_terms: D000818:Animals; D001001:Anura; D002118:Calcium / Q000494:pharmacology; D005071:Evoked Potentials / Q000187:drug effects; D008274:Magnesium / Q000494:pharmacology; D009119:Muscle Contraction / Q000187:drug effects; D009469:Neuromuscular Junction / Q000502:physiology*; D011894:Rana pipiens; D013569:Synapses / Q000502:physiology*; D009435:Synaptic Transmission / Q000187:drug effects
chemical_list: D008274:Magnesium; D002118:Calcium