SCYL1 and Ataxia: The twosubjects who are homozygous for a stop mutation at the beginning of the gene(F4:II.1 and F4:II.2) displayed mild motor delay with frequent falls, mild proximalmuscle weakness, and an abnormal gait (Table1,Supplementary TableS3) with one individual showing hints of a mild polyneuropathy.However, in contrast to previously reported SCYL1 patients, no ataxia was observedin any subjects in this study.