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Expression of xlnA and xlnB genes in A. nidulans wild-type mycelium in response to external pH. Carbon (C) sources present were d-fructose (F) and d-xylose (X). pH conditions are indicated as follows: H+, acidic; Ne, neutral; and OH−, alkaline. The actual pHs of the culture media at the time of recovery of mycelia for RNA isolation are indicated in parentheses. Actin gene expression is shown as a loading control.
