Additional file 3: Online Resource 3. A single intranigral administration of BSSG causes pathological α-synuclein aggregates in different brain regions. Representative micrographs of α-synuclein immunohistochemistry in sagittal slices of (a) mock and (b) BSSG groups on day 120 after the lesion showing α-synuclein aggregates in the olfactory bulb (1), hippocampus (2), cortex (3), M1-cortex (4), locus coeruleus (5), substantia nigra (6) and striatum (7). The scale bars = 1 mm for the panoramic views and 100 μm for magnifications.