Even so, El-Agnaf et al. (2006) suggested that oligomeric forms of α-synuclein in blood of PD are significantly more than those of non-PD controls by using an ELISA that only monitors oligomeric “soluble aggregates” levels of α-synuclein with a specificity of 85.2% and sensitivity of 52.9%. The gene discussed is SNCA; the disease is Parkinson disease.