Additional file 5: Online Resource 5. Correlation analysis of α-synuclein area density with the survival percentage of dopaminergic neurons (a and b), immunofluorescence area density (IFAD) of active caspase-3 (c and d), and β-Gal(+) area density (e and f) in the injured and control SNpc. Pearson’s correlation coefficient and linear regression appear on the top of every graph. p