Sequence encoding a 3' portion of human MLLT3 extending from nucleotide 1634 to the translation terminus replaced a 3' portion of murine Kmt2a exon 8. A downstream neo cassette was also included in the targeting vector for selection. The resultant fusion product putatively recapitulates the KMT2A(MLL)/MLLT3 protein produced in patients with the acute myeloid leukamia (AML) associated transloaction T(9;11)(p22;q23). (J:75959)