IndraLab
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"The effects of different cytokines on STAT1 S727 phosphorylation in WT and dKO 293 cells are shown in xref D. While the tested cytokines had little effect in the WT cells, the lower basal STAT1 S727 phosphorylation in the dKO cells (lacking CDK8/19) was increased by EGF, TNFα and serum. xref E shows that CDK8/19-independent STAT1 S727 phosphorylation in dKO 293 cells was also increased by cytotoxic drugs etoposide and Taxol; the time course of the induction of CDK8/19-independent STAT1 S727 phosphorylation by 50 nM Taxol in dKO 293 cells is shown in xref F."