[1] COLUMBIA UNIV COLL PHYS & SURG, H HOUSTON MERRITT CLIN RES CTR MUSCULAR DYSTROPHY, NEW YORK, NY 10032 USA
[2] UNIV MICHIGAN, SCH MED, DEPT MICROBIOL & IMMUNOL, ANN ARBOR, MI 48109 USA
[3] WAYNE STATE UNIV, SCH MED, DEPT MOLEC BIOL & GENET, DETROIT, MI 48201 USA