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. 2016 Aug 31;6:32272. doi: 10.1038/srep32272

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(A) Absolute total concentration of labeled metabolites in tumor and normal (negative) mPREF extracted metabolomic samples. (B) Example of base-peak ion chromatogram of Dns-labeled sample obtained by LC-MS. (C) Example of mass spectral peak pair of a ¹³C-/¹²C-dansyl labeled metabolite (Dns-Alanine). (D) Number of peak pairs as a function of common peak pair percentage across all the samples.