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High expression of transforming growth factor (TGF)-β in naive and virus-infected aging mice. (A) Active TGF-β levels were measured in BAL fluid from naive and MHV68 infected young and old mice at 7 and 15 dpi (n = 3). (B) Quantitative RT-PCR analysis for TGF-β transcripts in the lungs of naive and infected young and old mice at different time point after infection (*P < 0.05; n = 4).
