SNCA and Parkinson disease: In contrast, Li et al. performed semi-quantitative immunoblot analysis to measure the blood α-synuclein levels using antibody 97/8, which is specific for the α-synuclein C-terminal region, in 27 PD and 11 non-PD cases, and found significantly decreased α-synuclein levels in the PD cases compared to the non-PD controls [20].