a, Illustration of wild-type (WT) and DNA-binding domain (DBD) recombinant PU.1 and C/EBPα. b, Coomassie stained SDS-PAGE of 1 ug of each indicated purified protein. c, DNase I digestion analysis of WT and DBD TF opening of H1-compacted chromatin. d, Quantified Cy5 signal in each lane normalized to no TF control (n=4, *p < 0.05). Data are mean ± SD and significance was determined by Student’s unpaired t-test.