The authors’ citation for the role that the protein alpha-synuclein plays in Parkinson’s disease and Dementia with Lewy Bodies comes from a paper published in a 1998 edition of the Proceedings of the National Academy of Sciences of the United States of America authored by Spillantini, Crowther, Jakes, Hasegawa, and Goedert (Spillantini et al., 1998). This evidence concerns the gene SNCA and Lewy body dementia.