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Growth curves of nine C. difficile isolates, four of which carry the ABC transporter genes CDR20291_0805 and CDR20291_0806 in their genomes (blue lines), and five of which lack these two genes (red lines). (A) Growth in WIC broth with 0.1% (4-hydroxyphenyl)acetate. (B) Growth in WIC broth with 0.1% (4-hydroxyphenyl)acetate and 0.1% p-cresol. Lowered growth rates and lowered final cell densities 0.1% p-cresol had been reported previously (Dawson et al., 2008).
