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Vascular density and luminal surface area of pulmonary resistance arteries. Representative micrographs (10x) of Van Gieson stained lung sections (A), vascular density (B), and luminal surface area (C). Groups are control (CN, open bars, n = 5) and melatonin treated (MN, closed bars, n = 5) lambs. Values are means ± SEM. Significant differences (P ≤ 0.05): *vs. CN. Scale bar: 500 μm.
