Position of the chromosome 11 breakpoint with respect to the 11p15.5 markers used for FISH and PCR mapping. NUP98 lies within the candidate breakpoint region indicated by the arrowed line. The β chain of hemoglobin (HBBC) and the H-ras oncogene (HRAS) are at the extremities of 11p15.5. C and T denote centromeric and telomeric, respectively.