 This study demonstrated that a new method called long-range PCR can be used to identify and measure the size of FGF14 GAa repeats in patients with spinocerebellar ataxia 27b. Long-range PCR is more accurate than other methods such as gel electrophoresis or targeted nanopore sequencing, and can be used to diagnose patients with FGF14 GAa repeats. This article was authored by Celine Bonnet, David Pellerin, Virginia Roth, and others.