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Elastin stain. Photomicrographs of 5-μm lung sections from 13-day-old hyperoxia-exposed WT and MMP-9 (−/−) neonatal mice stained with Van Gieson stain for elastin (×40 magnification). Arrows point to the positive stain for elastin in the tip of the crest in room air-exposed lungs and in the body of the alveolar crests in hyperoxia exposed lungs.
