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Endothelium-dependent relaxation to Acetylcholine in isolated rat pulmonary artery rings. Ach= Acetylcholine. *P<0.05 vs CON; #P<0.05 vs ALI; △P<0.05 vs LV; Six Rats/Group. CON=Control Group, ALI=Acute lung injury Group, LV=Low tidal volume Group, VLV=Very low tidal volume Group, MV=Large tidal volume Group.
