Summary of the physical map in 13q12 encompassing the 8; 13 translocation breakpoint. The relative positions of the markers in YAC 943E4 are shown based on reports by Guilford et al7 and Still et al.8 The YAC is indicated by the horizontal bar, and the physical map relative to the breakpoint region is shown above. The thin horizontal line within the YAC indicates the presence of a deletion based on the absence of markers as determined by PCR. The map is oriented relative to the 13 centromere (cen) and the long arm telomere (qter). The 8; 13 translocation breakpoint lies between KIAA177 and D13S1123 as determined by somatic cell hybrid analysis.