PPP1CB and myeloid leukemia: We transfected two human myeloid leukemia cell lines (KG-1 and K562) and a non-hematopoietic mammalian cell line NIH 3T3, with the mp/GFP, Up2-mp/GFP and the Up2a-mp/GFP constructs along with a CMV β-galactosidase plasmid to normalize for transfection efficiency.