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. Author manuscript; available in PMC: 2014 Jul 16.
Published in final edited form as: Anal Chem. 2013 Jul 2;85(14):6598–6602. doi: 10.1021/ac401396j

Figure 4.

Figure 4

Calibration curves for L-DOPA, NE, DA, and 5-HT. The error bars were deduced from five replicates. A and A0 are the peak areas of analytes and the internal standard, respectively.