4YUF:
reference: Structural basis of head to head polyketide fusion by CorB., Zocher G, Vilstrup J, Heine D, Hallab A, Goralski E, Hertweck C, Stahl M, Schaberle TF, Stehle T, Chem Sci. 2015 Nov 13;6(11):6525-6536. doi: 10.1039/c5sc02488a. Epub 2015 Aug 6. PMID: 28757960

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