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Production of flavones in E. coli expressing ZmFNSI-1. HPLC profiles show FNS activity products in bioconversion assays in E. coli cultures expressing ZmFNSI-1 (A) and PcFNS (B) as a positive control or transformed with the empty vector (C) supplemented with naringenin, showing apigenin production. Naringenin and apigenin standards were used as controls (D). mAU, Milliabsorbance units.
