The MLL/MEN fusion was consistent in all three cases of the t(11;19)(q23;p13.1)-carrying leukemia examined by RNA-based polymerase chain reaction.     ///    Cloning of several species of MLL/MEN chimeric cDNAs in myeloid leukemia with t(11;19)(q23;p13.1) translocation..     ///    The MLL/MEN fusion transcripts of 8.0 kb were detected in leukemic cells of two cases with the translocation.     ///    "Although the MLL gene was alternatively spliced, the fusion protein should contain an N-terminal half of the MLL, including AT hook motifs, that is fused to the MEN protein with a lysine-rich sequence, suggesting that the MLL/MEN fusion protein could be a chimeric transcription factor. "