title: Caffeine contractures induced in frog auricular trabeculae in the absence of external calcium.
mesh_terms: D000818:Animals; D001001:Anura; D002110:Caffeine / Q000494:pharmacology*; D002118:Calcium / Q000378:metabolism / Q000494:pharmacology*; D006321:Heart / Q000187:drug effects*; D006325:Heart Atria / Q000187:drug effects; D066298:In Vitro Techniques; D009119:Muscle Contraction / Q000187:drug effects*; D011188:Potassium / Q000494:pharmacology; D012964:Sodium / Q000494:pharmacology
chemical_list: D002110:Caffeine; D012964:Sodium; D011188:Potassium; D002118:Calcium