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Reactions of halogenases. (A) General reaction mechanism for halogenase-mediated halogenation (EAS = Electrophilic aromatic substitution). (B) Halogenation, Pd-catalyzed Suzuki coupling cascade for late-stage functionalization of indole natural product scaffolds.45 (C) Evolution of RebH variants using substrate walking from simple indole derivatives to pentacyclic alkaloids.46
