Correspondence regarding Ballana et al., "Mitochondrial 12S rRNA gene mutations affect RNA secondary structure and lead to variable penetrance in hearing impairment" - Abreu-Silva, Ronaldo Serafim; Batissoco, Ana Carla; Lezirovitz, Karina; Romanos, Jihane; Rincon, Daniel; Auricchio, Maria Teresa Ballester de Melo; Otto, Paulo A; Mingroni Netto, Regina Celia (Biochemical and Biophysical Research Communications, 2006)