RT Journal Article SR Electronic T1 Heteroplasmy for the 1555A>G mutation in the mitochondrial 12S rRNA gene in six Spanish families with non-syndromic hearing loss JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 632 OP 636 DO 10.1136/jmg.40.8.632 VO 40 IS 8 A1 F J del Castillo A1 M Rodríguez-Ballesteros A1 Y Martín A1 B Arellano A1 J Gallo-Terán A1 C Morales-Angulo A1 R Ramírez-Camacho A1 M Cruz Tapia A1 J Solanellas A1 A Martínez-Conde A1 M Villamar A1 M A Moreno-Pelayo A1 F Moreno A1 I del Castillo YR 2003 UL http://jmg.bmj.com/content/40/8/632.abstract AB