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Immunochemical detection of MDI in situ. Lung tissue sections obtained during autopsy were stained with hematoxylin-eosin (A), negative control affinity-purified anti-KLH polyclonal rabbit IgG (B) or affinity-purified anti-MDI polyclonal rabbit IgG (C). Note brown DAB staining detecting MDI in the thickened basement membrane surrounding a highly inflamed bronchiole.
