6SMP:
reference: Structural snapshots of the minimal PKS system responsible for octaketide biosynthesis., Brauer A, Zhou Q, Grammbitter GLC, Schmalhofer M, Ruhl M, Kaila VRI, Bode HB, Groll M, Nat Chem. 2020 Aug;12(8):755-763. doi: 10.1038/s41557-020-0491-7. Epub 2020 Jul, 6. PMID: 32632186

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