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PCA score diagram of cell samples in negative (A, C) and positive (B, D) ESI modes. (A, B) HILIC-Q-TOF/MS [(A): NEG-R2X = 83%, Q2 = 53%; (B): POS- R2X = 97%, Q2 = 82%], (C, D) RPLC-Q-TOF/MS [(C): NEG-R2X = 99%, Q2 = 97%; (D): POS- R2X = 98%, Q2 = 94%]. Each point represents a cell sample.
