RT Journal Article SR Electronic T1 Genetic background affects expression of a mitochondrial mutation JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 949 OP 949 DO 10.1136/bjo.86.9.949 VO 86 IS 9 YR 2002 UL http://bjo.bmj.com/content/86/9/949.abstract AB