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Insertional inactivation of gdsE abolishes gladiostatin production in B. gladioli BCC1622. Extracted ion chromatograms at m/z 506.27±0.02 (corresponding to [M+H]+ for gladiostatin) from UHPLC‐ESI‐Q‐TOF‐MS analysis of ethyl acetate extracts of B. gladioli BCC1622 (top) and the gdsE mutant (bottom).
