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Fig. 2


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The analysis of a mixed standard solution of monoamines and their metabolites with chromatogram of high-performance liquid chromatography and an electrochemical detector (HPLC-ECD), and the retention time of each peak. NE: norepinephrine; EPI: epinephrine; DOPAC: 3.4-dihydroxyphenylacetic acid; DA: dopamine; 5-HIAA: 5-hydroxyindoleacetic acid; HVA: homovanillic acid; 5-HT: serotonin.

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