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Molecular structures of (A) epinephrine, (B) norepinephrine, and (C) serotonin (upper, solid line in the voltammogram) and histamine (lower, dotted line in the voltammogram) with corresponding voltammograms. Figures (A) and (B) modified with permission from American Chemical Society from Reference 40, and Figure (C) modified with permission from American Chemical Society from Reference 52.
