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Cytokine and chemokine mRNA expression profiles in aged mice. RNA was taken from the lungs of aged mice vaccinated with DIV plus alum and challenged with icHC/SZ/61/03 at 2 and 4 days postinfection. Cytokine and chemokine mRNAs were measured by quantitative real-time RT-PCR. The values are shown as log10 fold change over an unvaccinated, unchallenged control. *, P < 0.05; **, P < 0.01. The error bars indicate standard deviations.
