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The response of 1138H bitransgenic mouse lungs after the administration and withdrawal of RU486 at 2-week intervals. H&E staining of lung sections from 1138H bitransgenic mice: treated with placebo (A); treated with 500 μg/kg RU486 for 2 weeks (B); 2 weeks after the withdrawal of RU486 (C); and re-treated with 500 μg/kg RU486 for 2 weeks after withdrawal (D).
