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Pulmonary arteries stained by terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) assay in a patient treated with high-dose prostaglandin I2. Green is TUNEL-positive. Red is α-smooth muscle actin. Blue is 4′,6-diamidino-2-phenylindole. Bar = 100 μm. Arrows indicated TUNEL-positive cells.
