- Trinucleotide repeat expansion in the FRAXE locus is not common among institutionalized individuals with non-specific developmental disabilities. Holden, J.J., Julien-Inalsingh, C., Chalifoux, M., Wing, M., Scott, E., Fidler, K., Swift, I., Maidment, B., Knight, S.J., Davies, K.E., White, B.N. Am. J. Med. Genet. (1996)