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TheAspergillus nidulans xylanase genesxlnA andxlnB are subject to regulation by ambient pH via the zinc finger transcription factor PacC. In the presence ofd -xylose,xlnA is expressed under conditions of alkaline ambient pH whilexlnB is expressed at acidic ambient pH. These data have been confirmed for acidity- and alkalinity-mimickingA. nidulans mutants.

Opposite Patterns of Expression of Two Aspergillus nidulans Xylanase Genes with Respect to Ambient pH