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Normalized relative quantification of mRNA expression by real-time PCR for TNF-α, IFN-γ, and IL-12. Shown are the means ± standard errors of the mean of the ratio of the cytokine to HPRT. The same ratios were obtained with β-actin. Hours (from 1 to 22) and days (from D1 to D4) p.i. are indicated on the x axis.
