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Orthogonal partial least squares regression models. (A) Gas chromatography–mass spectrometry (R 2 = 0.998, Q 2 = 0.678), (B) capillary electrophoresis–mass spectrometry ESI(+) (R 2 = 0.929, Q 2 = 0.816), (C) liquid chromatography–mass spectrometry ESI(+) (R 2 = 0.827, Q 2 = 0.699), (D) liquid chromatography–mass spectrometry ESI(−) (R 2 = 0.827, Q 2 = 0.703). Blue dots, control; green dots, cachexia.
