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ACD/MPV pulmonary microvasculature lacks SERT expression (3,3′-diaminobenzidine, SERT). Representative sections from 5 different ACD cases ((a)–(e)) show absence (no brown stain noted) of SERT staining (200x). (f) Positive control stained with the pan-endothelial marker CD31 (brown stain) to assess pulmonary endothelial cell preservation).
