A follow-up study in PD patients who received fetal brain tissue transplantation revealed that 11–16 years after transplantation, the content and nature of LBs in transplanted neurons were basically the same as those of LBs in dopaminergic cells in the brains of PD patients, which provides evidence for the diffusion of α-synuclein prion-like molecules (Kordower et al., 2008; Li et al., 2008; Kurowska et al., 2011). Here, SNCA is linked to Parkinson disease.