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. 2018 Aug 2;7(3):42. doi: 10.3390/biology7030042

Scheme 6.

Scheme 6

Chlorination of L-tryptophan by the halogenase RebH. FAD is recycled by the NADH-dependent oxidoreductase RebF. This reaction represents the initial step in the synthesis of the antitumor agent rebeccamycin [217].