Two types of genomic rearrangements create alternative E2A-HLF fusion proteins in t(17;19)-ALL..     ///    These features underscore the requirement for DNA binding and/or dimerization conferred by the bZIP portion of the E2A-HLF chimera in t(17;19)-ALL..     ///     The t(17;19)(q21-q22;p13.3) in acute lymphoblastic leukemia results in creation of an E2A-HLF fusion protein with structural and functional properties of a chimeric transcription factor. 