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Proposed biosynthetic pathway for HSAF involving both polyketide and nonribosomal peptide mechanisms. SEnz, the thiol group of the phosphopantetheinyl cofactor of the carrier proteins (acyl carrier protein or peptidyl carrier protein) within the polyketide synthase or nonribosomal pepetide synthetase; OH-Orn, β-hydroxyornithine. Note that the sequence of the biosynthetic steps illustrated here is just one of several possibilities.
