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Combined effect of NaHS (10 nM) and sildenafil citrate (10 nM) on tumour necrosis factor-α (TNFα) (10 ng mL−1)-induced O2•− formation from pulmonary arterial endothelial cell (PAEC) after 16-h incubation. Each point is the mean±s.e.mean, n=6. *P<0.01; significantly inhibited compared with NaHS or sildenafil alone.
