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Expression of the LEE espA and tir genes, measured by qRT-PCR, in stools of Dbh+/− and Dbh−/− mice infected with WT, ΔqseC, ΔqseE, and ΔqseEC C. rodentium on day 7 postinfection. PBS mice were used as negative controls. *, P < 0.05; **, P < 0.0001.