- Interstitial deletion of chromosome 9, int del(9)(9q22.31-q31.2), including the genes causing multiple basal cell nevus syndrome and Robinow/brachydactyly 1 syndrome. Olivieri, C., Maraschio, P., Caselli, D., Martini, C., Beluffi, G., Maserati, E., Danesino, C. Eur. J. Pediatr. (2003)