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AREA expression and its role in the regulation of the TRI gene. (A) Relative expression level of AREA in complete medium (CM) cultures with 50 mm ammonium (NH4+; arbitrarily set to unity) or nitrate (NO3 −) as the sole nitrogen source. (B) The expression level of TRI5 and TRI6 in cultures of the wild‐type strain PH‐1 and ΔareA mutant grown under nitrogen starvation (NS) or ammonium suppression (AS; arbitrarily set to unity) conditions.
