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PLS-DA loading plots of the four tested groups from UPLC-Q-TOF-MS profiling data. Red triangles represent responses; Blacks represent X variables. (A) PLS-DA loading plot from positive ion mode; (B) PLS-DA loading plot from negative ion mode. PLS-DA, Partial least squares discriminant analysis; UPLC-Q-TOF-MS, Ultra-performance liquid chromatography-quadrupole-time-of-flight-mass spectrometry.
