- Mapping the facioscapulohumeral muscular dystrophy gene is complicated by chromsome 4q35 recombination events. Weiffenbach, B., Dubois, J., Storvick, D., Tawil, R., Jacobsen, S.J., Gilbert, J., Wijmenga, C., Mendell, J.R., Winokur, S., Altherr, M.R. Nat. Genet. (1993)