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Photomicrographs of representative sections of lungs from bleomycin-treated WT mice (n = 3) 14 days after treatment immunostained with an anti-MMP-12 antibody. A: Deposition of MMP-12 is observed in the alveolar walls (arrows) associated with areas of extensive hemorrhage (h); original magnification, ×100. B: MMP-12 is concentrated in the capillaries (arrows) in the wall of the alveoli (a); original magnification, ×400.
