CFP and myeloid leukemia: The myeloid leukemia K562 cells that do not express endogenous β2 integrins were transfected with expression plasmids of integrin αL and Dok1-CFP (CFP fused to the C-terminus of Dok-1) and integrin β2-YFP wild-type or S745G/S756G or S745E/S756E.