For instance, aggregates induced by α‐synuclein obtained from glial cytoplasmic inclusions in MSA have different properties than those seeded from Lewy body (LB)‐derived α‐synuclein.30 We are currently developing methods to identify the types of aggregates formed in the SAAs, which may be useful to differentiate PD from atypical parkinsonism. This evidence concerns the gene PCSK1N and Parkinson disease.