FMR1 and fragile X-associated tremor/ataxia syndrome: Changes in cytidine abundance were not reported in the plasma from FXTAS patients; however, a decreased level of choline phosphate, an intermediate of the Kennedy pathway, was observed in FMR1 premutation carriers who had developed FXTAS [5]; a lower abundance of cytidine was also found in the cerebellum of premutation mice [6].