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Interaction of different systems for induction of faeA expression. Relationships between XlnR and ferulic acid induction of faeA expression were studied by incubating A. niger N402 and NXA1-4 (XlnR mutant) mycelia for 2 h in minimal medium containing different carbon sources. The blots are Northern blots prepared as described in the text. 18S rRNA was used as an RNA loading control. Abbreviations: xyl, xylose; ara, arabinose; FA, ferulic acid.
