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. Author manuscript; available in PMC: 2016 Dec 1.
Published in final edited form as: Free Radic Biol Med. 2015 Sep 21;89:220–228. doi: 10.1016/j.freeradbiomed.2015.08.003

Fig. 1.

Fig. 1

Oxidation of tryptophan to N-formylkynurenine (NFK) and kynurenine. Modified from GieβSauf et al. (59). Originally published in FRBM 46:1260–66,2009 (33).