(K) KLF4 PARylation enhances its transcriptional function demonstrated by p21 promoter luciferase assay. 293T cells were co-transfected with p21 luciferase reporter plasmid with wild-type or mutant KLF4 (YYR/AAA) and wild-type or mutant PARP1 (H909A) and then submitted to luciferase assay. n=3, p=4.74x10-6 (PARP1WT vs PARP1H909A), Data are mean ± SEM; one-way ANOVA was used for the statistical analysis. 