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The autoxidation of L-DOPA and dopamine was followed by h.p.l.c. with electrochemical detection in the (A) absence or in the (B) presence of different concentrations (50–1000 μM) of ascorbic acid (AA). Each symbol or column represents the mean of 3–16 experiments per group; vertical lines show s.e.mean. *P<0.05 compared with control.
