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(A) Proposed biosynthetic pathway for geldanamycin in its native producer. (B) Proposed biosynthetic pathway for KOSN-1869 in the KR6 null strain. The dashed lines through DH6, ER6 (enoyl reductase 6), KR7, DH7, and post-PKS modifications indicate that the reactions did not occur. AHBA, 3-hydroxy-5-aminobenzoic acid; ACP, acyl carrier protein.
