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OPLS-DA score plots of urinary metabolites derived from the control (black squares), glutamine (green triangles), and N-carbamylglutamate (red circles) ((A), R2X = 0.202, Q2 = 0.486; (B), R2X = 0.307, Q2 = 0.773; (C), R2X = 0.292, Q2 = 0.780) groups.
