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Increased in vivo inflammatory cytokine mRNA responses in the intestinal tissue from Listeria monocytogenes-infected old mice. Intestinal tissues from uninfected and L. monocytogenes (Lm)-infected mice of both age groups at 7-days post infection were used for RNA extraction and IFN-γ (A), IL17a (B), IL-10 (C), and IL-23 (D) mRNA expression were measured. Data from mean ± SEM from a representative experiment using 4–6 mice. *p < 0.05.
