Myb: a transcriptional activator linking proliferation and differentiation in hematopoietic cells.

Myb is a transcriptional activator protein with repeated helix-turn-helix DNA-binding motifs distantly related to the homeodomain. In hematopoiesis, c-myb appears to control both cell proliferation and differentiation. The mechanisms by which the leukemogenic potential of c-Myb is activated are complex and involve truncations, point mutations, and fusion or coexpression with other proteins.