In addition, because most motifs bound by Pbx-Meis1/pKnox1 were not bound by Pbx1-Hox complexes, the leukemic potential of Meis1 in myeloid leukemias may involve shifting Pbx proteins from promoters containing Pbx-Hox motifs to those containing Pbx-Meis motifs..     ///    The Meis1/pKnox1-interaction domain in Pbx1 resided predominantly in a conserved N-terminal Pbx domain deleted in E2a-Pbx1. 