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Effect of Neonatal hyperoxia on pulmonary microvascular development. Pulmonary microvascular volume was assessed using stereological analysis on von Willebrand-stained lung sections to identify vessels 20–50μm in diameter. Values are expressed as means±SEM. *P < 0.05 versus RA by one way ANOVA using Tukey’s multiple comparison post-test analysis. Results are representative of three independent experiments. n = 11 (RA), 10 (O2 P0-P4), 12 (O2 P0-P7), 9 (O2 P0-P14).
