Of these, 7 MSA cases (1.07%, 7/657) carried an FGF14 GAA≥300 expansion (Supplementary Fig. 1) and 12 MSA cases (1.83%, 12/657) carried an FGF14 GAA250–299 expansion (Table 1 and Supplementary Fig. 2). Here, FGF14 is linked to multiple system atrophy.