title: Cyclic changes in levels of cyclic AMP and cyclic GMP in frog myocardium during the cardiac cycle.
mesh_terms: D000818:Animals; D001001:Anura; D012831:Bombyx / Q000201:enzymology; D000242:Cyclic AMP / Q000378:metabolism*; D006152:Cyclic GMP / Q000378:metabolism*; D004562:Electrocardiography; D006321:Heart / Q000502:physiology; D006339:Heart Rate; D009206:Myocardium / Q000378:metabolism*; D011494:Protein Kinases; D011896:Rana temporaria; D013997:Time Factors
chemical_list: D000242:Cyclic AMP; D011494:Protein Kinases; D006152:Cyclic GMP