6FIK:
reference: The structural organization of substrate loading in iterative polyketide synthases., Herbst DA, Huitt-Roehl CR, Jakob RP, Kravetz JM, Storm PA, Alley JR, Townsend CA, Maier T, Nat Chem Biol. 2018 Apr 2. pii: 10.1038/s41589-018-0026-3. doi:, 10.1038/s41589-018-0026-3. PMID: 29610486

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