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This study aimed to evaluate the effect of betulinic acid (BA) on acute lung damage induced by bacterial endotoxin (lipopolysaccharide, LPS) in male Sprague–Dawley rats and explore its possible mechanisms. Oral administration of 25 (mg/kg) BA started 7days before LPS or saline nasal installation. Twenty-four hours after LPS or saline installation, samples of lung tissues were collected for determination...
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