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(A) Schematic of the bactobolin biosynthetic cluster detailing genes btaA through btaU. (B) Proposed biosynthetic scheme for bactobolin D. Note that the aldol condensation (ALC) and thioesterase (TE) reactions are not assigned to a specific protein or domain. See text for details. Inset, proposed biosynthesis of OH-Cl2-Val and its subsequent transfer to the NRPS/PKS assembly line.
