Figure 8 contained the same graph twice. The correct figure is given here.

Fig. 8
figure 1

Effect of s.c. injections of ketamine on extracellular levels of HVA within the nucleus accumbens in both anaesthetized (top) and freely moving (bottom) rats. Asterisk indicates p<0.05 25 mg/kg vs saline, while number sign indicates p<0.05 10 mg/kg vs saline as measured with post hoc independent t test (or Mann–Whitney U test if equality of variances is violated)

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