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Representative chromatographs of mixed standard solution (A), matrices of cortex (B), matrices spiked with IS (C), and matrices spiked with standards and IS (D). Figure note: Tyr (1), MHPG (2), NE (3), DOPAC(4), E (5), 5-HIAA (6), DA (7), vanillic acid (8), Trp (9), HVA (10), 3-MT (11), 5-HT (12).
