Metabolomics of Esophageal Squamous Cell Carcinoma Tissues: Potential Biomarkers for Diagnosis and Promising Targets for Therapy

Figure 1

Quality control chart of control samples. (a) ESI (+) total ion chromatogram of control samples; (b) ESI (-) total ion chromatogram of control samples; abscissa is time; ordinate is the sum of ionic strength; (c) ESI (+) QC sample evaluation chart; (d) ESI (-) QC sample evaluation chart; note: RSD (%): standard deviation/mean value.

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