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. 2012 May 5;11(9):619–628. doi: 10.1074/mcp.M112.017178

Fig. 1.

Fig. 1.

Workflow of the method comparison. Metabolic labeling: Labeled and unlabeled cell cultures were mixed at different protein ratios prior to protein digestion and mass spectrometric analysis. Intensity ratios were directly determined from the acquired MS spectra. Label-free comparison: Different total amounts of protein was digested and analyzed. Total ion chromatograms were then aligned and intensity ratios were calculated from different raw files.