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Polyketide synthase type III overview. (A) Schematic overview of the cyclization of linear tetraketide intermediates by type III polyketide synthases. (B) Proposed mechanism of the C1 thioesterase cleavage of the linear tetraketide intermediate from the active site of STS (adapted from 12). (C) Proposed mechanism of naringenin formation by CHS via C6 → C1 Claisen condensation (adapted from 14).
