Patient no. 8, with der(5) t(5;17) by GTG banding and WCP. Non identified chromosome material was translocated on the other chromosome 5 (add(5)). Some chromosome 5 material was also found on a marker chromosome (mar(5)). Another marker chromosome contained chromosome 17 material which included the p53 gene (fig 2B) and other markers studied on 17p. This marker (mar(17)) also contained chromosome 7 material. Therefore, this patient apparently had no visible deletion of 17p material.