Fig. 2.
Constitutive activation of a STAT-like DNA-binding factor in Dami/HEL and Meg-01 cells. Nuclear extracts from each cell line cultured in the absence of cytokine (CTL) or in the presence of as much as 400 ng/mL TPO or 40 ng/mL IL-3, were incubated with [32P]-labeled, double-stranded IRF-1 GAS oligonucleotide. The DNA-binding complex and unbound probes were separated electrophoretically on 5% nondenaturing polyacrylamide gels. The autoradiograph shows the STAT-like DNA-binding factor (DBF) and the nonspecific bands (NS).