- Expansion and methylation status at FRAXE can be detected on EcoRI blots used for FRAXA diagnosis: analysis of four FRAXE families with mild mental retardation in males. Biancalana, V., Taine, L., Bouix, J.C., Finck, S., Chauvin, A., De Verneuil, H., Knight, S.J., Stoll, C., Lacombe, D., Mandel, J.L. Am. J. Hum. Genet. (1996)