(C) KLF4-Zinc 2-YYR/AAA mutation has only effect on KLF4 PARylation but not on other types posttranslational modifications such as protein methylation, ubiquitylation, acetylation and sumoylation in 293T cells. The FLAG-tagged wild-type or mutant KLF4 were immunoprecipitated with FLAG and detected by anti-SYM10 (methylation), anti-SUMO (sumoylation), Anti-ac-lysine (acetylation), anti-Ub (ubiquitination) and anti-PAR (PARylation). 