However, in the later stages of fermentation, the CgAS expression level presented a decreasing trend, consistent with the results of extracellular tryptophan analysis.
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<i>CgAS</i>, a gene encoding anthranilic acid synthase, contributes to tryptophan biosynthesis and enhanced chaetoglobosin A production in <i>Chaetomium globosum</i> W7.
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