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Proposed precolibactin biosynthesis. Domains: C, condensation; A, adenylation; T, thiolation; E, epimerase; KS, ketosynthase; AT, acyltransferase; KR, ketoreductase; DH, dehydratase; ER, enoyl reductase; AT*, deteriorated AT; Cy, dual condensation/cyclization; Ox, oxidase/dehydrogenase; TE, thioesterase.
