1. Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
2. Medical Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD 20814, USA.
3. Department of Orthopaedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
4. Baltimore Veterans Administrations Medical Center, Baltimore, MD 21201, USA.
5. National Eye Institute, National Institutes of Health, Bethesda, MD 20814, USA.
6. PXE Reference Center and MitoVasc Institute, Angers University Hospital, Angers, France.
7. Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA 92037, USA.
8. Howard Hughes Medical Institute, Chevy Chase, MD 20815, USA.