(H, I) RNA EMSA evaluation of EZh2 binding of p53 mRNA. GST-EZH2 recombinant proteins (EZ1 to EZ4) were incubated with biotin-labeled in vitro transcribed p53 5'UTR (biotin-labeled probe) in the presence or absence of 100-fold unlabeled p53 5'UTR (unlabeled probe), followed by PAGE and immune blotting with HPR-conjugated streptavidin. 