Figs. 1 (a) and (b).

Motor activity, ambulation (a) and rearing (b) counts in groups of Wistar rats treated with As, Mn, Pb and a mixture of these metals (Mixt). Two control groups were used: prior to the administration (PD) and a sterile saline solution treated group (C). Data represent the mean ± SD (n=6). All groups were compared by Mann-Whitney U tests: a, b, c, d and e are p < 0.05 versus PD, C, As, Mn and Pb.