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Hyperoxia increased the numbers of neutrophils in neonatal mouse lungs, and the addition of iNO attenuated the hyperoxia-induced increase in neutrophil numbers. A) representative MPO stained images (800× magnification) of alveolar regions from lungs from mice from each of the 4 treatment groups. B) The mean ± SEM of the neutrophil numbers from all of the lung sections examined. * different from room air, p<0.05. ‡ different from >95% O2, p<0.05.
