Number of TH neurons (a, F = 185.443, p < 0.01) and OD of α-synuclein aggregates (b, F = 47.732, p < 0.01) in the ipsilateral SNc. 1 = Sham-operated animals (intact left SNc); 2 = saline-treated animals; 3, 4 and 5 = up to 7, 14 and 21 days after administration of lactacystin, respectively.