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Summary of expanded fragile X-associated tremor/ataxia syndrome (FXTAS) and premutation phenotypes. PSP progressive supranuclear gaze palsy; FMR1 fragile X mental retardation 1 gene; PC premutation carrier; BAP broad autism phenotype; AR activation ratio; MCP middle cerebellar peduncles. Asterisk indicates that this study was conducted in individuals with normal FMR1 repeat size
