title: Cyclic nucleotide levels during spontaneous uterine contractions.
mesh_terms: D000818:Animals; D000242:Cyclic AMP / Q000378:metabolism*; D006152:Cyclic GMP / Q000378:metabolism*; D004967:Estrogens / Q000494:pharmacology; D005260:Female; D007545:Isoproterenol / Q000494:pharmacology; D009119:Muscle Contraction; D009130:Muscle, Smooth / Q000502:physiology; D051381:Rats; D013806:Theophylline / Q000494:pharmacology; D013997:Time Factors; D014599:Uterus / Q000378:metabolism* / Q000502:physiology
chemical_list: D004967:Estrogens; D013806:Theophylline; D000242:Cyclic AMP; D006152:Cyclic GMP; D007545:Isoproterenol