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 affiliation: Roche Madison, Madison, WI 53711.
4. PlasmidFactory, D-33607 Bielefeld, Germany.
5. Association Française contre les Myopathies, 91002 Evry, France.
6. Transgene, 67405 Illkirch Graffenstaden, France.