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The positive cells were stained in yellow brown by TUNEL assay. Photomicrographs of TUNEL stained lung tissue of the non-COPD group (panel A) and the COPD group (panel B) (magnification: 400×). The number of TUNEL positive pulmonary vascular endothelial cells in the COPD group was much higher than that in the non-COPD group.
