Additional file 2: Online Resource 2. The ipsilateral and intranigral BSSG injection causes pathological α-synuclein propagation to the midbrain nuclei. Representative photomicrographs of (a) mock and (b) BSSG injured conditions showing α-synuclein aggregates in the red nucleus (1 and 2), SNpc (3 and 4), SNpr (5 and 6) and VTA (7). The scale bars = 1 mm for the panoramic views and 50 μm for magnifications.