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Biosynthesis of pyrichalasin H (1 a) and production of 4′‐substituted cytochalasins 1 b–1 h by mutasynthesis. Abbreviations: O‐MeT=O‐methyltransferase, MFS=major facilitator superfamily (transporter), P450=cytochrome P450 oxygenase, ER=trans‐acting enoyl reductase, pDA=putative Diels Alderase, TF=transcription factor, OAT=O‐acetyl transferase, OXR=oxidoreductase, PKS‐NRPS=polyketide synthase‐nonribosomal peptide synthetase.
