6C9U:
reference: Structure-Function Analysis of the Extended Conformation of a Polyketide Synthase Module., Li X, Sevillano N, La Greca F, Deis L, Liu YC, Deller MC, Mathews II, Matsui T, Cane DE, Craik CS, Khosla C, J Am Chem Soc. 2018 May 18. doi: 10.1021/jacs.8b02100. PMID: 29762030

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