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Moreover, emphysema, associated with increased oxidative stress in\n                    <jats:italic>Hhip<\/jats:italic>\n                    <jats:sup>+\/\u2212<\/jats:sup>\n                    lungs, was prevented by treating the mice with the antioxidant,\n                    <jats:italic>N<\/jats:italic>\n                    -acetyl cysteine (NAC). 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