PPP2R2B and myotonic dystrophy type 1: We also included PPP2R2B and DMPK, expansions of CAG•CTG repeats within which underlie spinocerebellar ataxia type 12 (SCA12, MIM #604326) and myotonic dystrophy type 1 (DM1, MIM #160900), respectively, but are not translated into polyglutamine.