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Relative gene expression. a afr, b adhE, c nan_A3, d nanB, e yesO_2 and f ycjO expression was determined by real-time RT-PCR and is displayed relative to the value of the lowest expression, after normalization using 16S RNA gene expression. The values are the means of four (afr) or three (all other genes) separate experiments. Error bars indicate standard error., *p ≤ 0.05, **p ≤ 0.01
