| http://www.w3.org/ns/prov#value | - None of these patients had persistent DA; rather the DA had been maintained patent by infusion of prostaglandin E1 where medically necessary.The DA is a prototypic member of the specialized oxygen homeostatic system, which also includes the type 1 cell in the carotid body, the neuroepithelial body, and resistance pulmonary artery SMC16.
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