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Immunoblot results for endothelial NO synthase (eNOS) in dissected third- and fourth-generation intrapulmonary airways (left) and arteries (right) excised from lungs of 1-day-old term lambs and preterm lambs given iNO, 5–15 ppm, during 3 weeks of mechanical ventilation. Term lambs were at the same postconceptional age as the preterm lambs, but did not receive mechanical ventilation or iNO. Densitometry showed no significant differences for either airways or arteries.
