5ING:
reference: A crotonyl-CoA reductase-carboxylase independent pathway for assembly of unusual alkylmalonyl-CoA polyketide synthase extender units., Ray L, Valentic TR, Miyazawa T, Withall DM, Song L, Milligan JC, Osada H, Takahashi S, Tsai SC, Challis GL, Nat Commun. 2016 Dec 21;7:13609. doi: 10.1038/ncomms13609. PMID: 28000660

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