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Fragile X Syndrome (FXS) vs. Fragile X-associated Tremor/Ataxia Syndrome (FXTAS). This figure demonstrates that FXS and FXTAS are very different disorders, and that each results from a different length of the repeat expansion that occurs in the same gene, fragile X mental retardation 1 (FMR1). Two males are shown, because males are more affected than females since the gene mutation is on the X chromosome.
