FGF14 and cerebellar ataxia: A Passing–Bablok regression model (Fig. 2C) was generated by comparing the size of LR-PCR products of expanded alleles.29 As a result of the above approaches, we identified 12 patients with cerebellar ataxia (12/155, 7.7%) carrying an FGF14 (GAA)≥250 repeat expansion.