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. 2009 Jan 9;329(1):297–305. doi: 10.1124/jpet.108.147751

Fig. 1.

Fig. 1.

Proposed human metabolism of [13C]pantoprazole and production of 3CO2 in breath. This metabolic pathway of 13C labeling is inferred from known metabolism of unlabeled pantoprazole (Tanaka et al., 1997a), assuming that both have similar metabolic pathways. *, formaldehyde; **, formic acid; ***, carbon dioxide.