Mapping of deletions and translocations involving chromosome band 7q22 in 21 myeloid leukemias by FISH. del, deletion (only 1 fluorescence signal); 3, three fluorescence signals indicating the translocation breakpoint; di, disomy (2 fluorescence signals indicating retention of both alleles); empty boxes, not done. Light grey boxes indicate the extent of the deletion. Dark grey boxes indicate the two commonly deleted segments in CML and MDS/AML, respectively. *Clones HSC7E808 through HSC7E572 recognize a contiguous genomic fragment in chromosome band 7q22.