Prolongation of the action potential plateau of embryonic chick hearts organ cultured in the presence of cyclic AMP.
D000200:Action Potentials / Q000187:drug effects*; D000818:Animals; D002642:Chick Embryo; D000242:Cyclic AMP / Q000494:pharmacology*; D006321:Heart / Q000187:drug effects*; D009924:Organ Culture Techniques; D011188:Potassium / Q000494:pharmacology; D013806:Theophylline / Q000494:pharmacology
D013806:Theophylline; D000242:Cyclic AMP; D011188:Potassium