1. Roche Madison, Madison, WI 53711.
2. Department of Pediatrics and Department of Medical Genetics, Waisman Center, University of Wisconsin-Madison, Madison, WI 53705.
3. Present address: Roche Madison, Madison, WI 53711.
4. Association Française contre les Myopathies, 91002 Evry, France.
5. Transgene, 67405 Illkirch-Graffenstaden, France.
6. Department of Medical Physics, Wisconsin National Primate Research Center, University of Wisconsin-Madison, Madison, WI 53715.