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Conversion of proline units to pyrroles: (a) selected natural products where the pyrrole moieties arise from flavoenzyme desaturation of prolyl-S-thiolation domains; (b) scheme for activation and desaturation of proline monomers on NRPS modules; (c) proposal for generation of pyridine carboxylate by iterative desaturation in collismycin A biosynthesis.
