- Mutations in the EXT1 and EXT2 genes in hereditary multiple exostoses. Wuyts, W., Van Hul, W., De Boulle, K., Hendrickx, J., Bakker, E., Vanhoenacker, F., Mollica, F., Lüdecke, H.J., Sayli, B.S., Pazzaglia, U.E., Mortier, G., Hamel, B., Conrad, E.U., Matsushita, M., Raskind, W.H., Willems, P.J. Am. J. Hum. Genet. (1998)