α‐Synuclein implicated in Parkinson's disease is present in extracellular biological fluids, including human plasma

Parkinson's disease (PD) and other related disorders are characterized by the accumulation of fibrillar aggregates of α‐synuclein protein (α‐syn) inside brain cells. It is likely that the formation of α‐syn aggregates plays a seminal role in the pathogenesis of at least some of these diseases, be…