title: Reply to: Double trouble progressive external ophthalmoplegia and Huntington's disease.
authors.affiliation: Clinical Neurology, Section for Neuromuscular Diseases and Neuropathies, University Hospital "Spedali Civili", Brescia, Italy.
authors.forename: Massimiliano
authors.initials: M
authors.lastname: Filosto
authors.affiliation: Unit of Molecular Medicine, IRCCS Stella Maris, Pisa, Italy.
authors.forename: Filippo M
authors.initials: FM
authors.lastname: Santorelli
keywords: CAG-repeat expansion; Huntingtin; Mitochondrial DNA; Trinucleotide expansion disorder; tRNA