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Untargeted metabolic profiling of CSF samples in POD patients and Non-POD patients. PCA (A: positive-ion mode; B: negative-ion mode) and PLS-DA (C: positive-ion mode; D: negative-ion mode) analyses of the DDA-based metabolomics data. The indicated groups are presented by different colors (green: POD; red: Non-POD; blue: QC).
