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Proposed mechanisms of extender unit incorporation in a generalized type I PKS module. For clarity, only the KS, AT, and ACP domains are shown. (A) Chemical transacylation of extender unit onto the ACP. (B) Direct diffusion of extender unit into the KS active site. ACP, acyl carrier protein; AT, acyltransferase; KS, ketosynthase; R1, growing polyketide chain; R2, H, Me, or F.
