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TUNEL assay results in lung tissues. There were no TUNEL positive cells (green) in the C group. TUNEL positivity was progressively increased by MCT treatment. Copious cell death was evident in the M group compared with the C group. In contrast, apoptotic cell death in the B group was ameliorated than the M group. TUNEL: terminal deoxynucleotidyl transferase dUTP nick end labeling, C: control group, M: monocrotaline group, B: bosentan group.
