SNCA and multiple system atrophy: Schweighauser Schweighauser M M Shi Shi Y Y Tarutani Tarutani A A Structures of alpha-synuclein filaments from multiple system atrophy Structures of alpha-synuclein filaments from multiple system atrophy Nature Nature 2020 2020 585 585 464 464 469 469 supplied-pmid 32461689?