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Correlations of absolute concentrations for metabolites derived from NMR and NMR-guided MS for eight healthy human (four male and four female) serum samples. Here, MS concentrations for one serum sample (serum 1, Table S3) were set equal to those derived from NMR and used as the references for the quantitation of the same metabolites in the remaining serum samples. Virtually identical results were obtained irrespective of the serum sample used as the reference.
