SNCA and Parkinson disease: Also proteins like alpha‐synuclein (α‐synuclein), which has long been implicated in the pathogenesis of PD (Polymeropoulos et al., 1997) could act as both modulators of glial functions and as antigens themselves activating the peripheral and central immune system (Harms et al., 2013; Reynolds et al., 2008; Sanchez‐Guajardo et al., 2015).