Figure 2

Graph showing TH⁺ cell number in the SNc in the four experimental groups, in either the Balb/c (grey columns) or C57BL/6 (black columns) mice. Columns show the mean ± standard error of the total number (of one side) in each group. There were ten animals per group. The symbols in the MPTP groups represent levels of significant difference in number from the Saline groups in each series, while symbols in the MPTP-NIr groups represent those from the MPTP groups; † represents p<0.001, ^ represents p<0.01 and * represents p<0.05.