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(A) Schematic representation of the ORFs in the oxaline (oxa) gene cluster. (B) Proposed biosynthetic pathway in P. oxalicum F30. The homologous enzymes from the roquefortine C/meleagrin (roq) gene cluster in P. chrysogenum are shown. A second methyltransferase, OxaC, lacks a homolog in P. chrysogenum.
