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Human study 13C MR data. A: Hepatic 13C spectra from a study volunteer prior to and after the 6h glycine ingestion period. B: Region of the 13C spectrum from a study volunteer showing resonances from [2-13C]-glycine, and endogenously 13C-labelled glutathione, serine and creatine. C-E: Mean concentrations of [2-13C]-glycine, 13C-labelled glutathione and [2-13C]-serine over the experimental timecourse.
