Development of the O 2  induced contractions in the ductus arteriosus of the guinea-pig.
D000818:Animals; D004373:Ductus Arteriosus / Q000187:drug effects*; D005260:Female; D005865:Gestational Age; D006168:Guinea Pigs; D009119:Muscle Contraction / Q000187:drug effects*; D009638:Norepinephrine / Q000494:pharmacology; D010100:Oxygen / Q000494:pharmacology*; D010313:Partial Pressure; D011247:Pregnancy
D010100:Oxygen; D009638:Norepinephrine