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Serum metabolomic analyses. (A,B) The PCA score plot and the PLS-DA scores plot in positive ion model and in negative ion mode, respectively. (C,D) Heatmaps of 18 metabolites and 8 metabolites in positive ion model and in negative ion model, respectively. Blue circle: QC sample, green circle: nonSAE group, red circle: SAE group. A: SAE group; B: nonSAE group.
