Schematic representation of generic V-D-J segments indicating the position of breakpoints within them. Samples can be broken down into groups based on the location of the breakpoint; D-J–mediated translocations (red) have breakpoints within 15 bp of the end of the D or J segments, whereas receptor revision–mediated translocations (blue) have breakpoints within, or near, the V and J segments with no D segment detected. Arcs indicate the positions of the breakpoints on both derivative chromosomes from the same sample. In some cases, both derivative chromosomes were not detected (solitary lines). Thin black lines on the D and J segments indicate 5-bp gaps.