Distribution of breakpoints identified by metaphase analysis in 33 patients with CLL. In 33 of 96 evaluable patients, 62 translocations were detected. Three patients (patients 4, 6, 8) had translocations involving 3 breakpoints (Table 1). This resulted in 127 breakpoints, but in 6 of 127 breakpoints, the exact band was not assignable; therefore, 121 breakpoints are displayed. Each dot represents a single breakpoint.