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  • An inhibitor of positive transcription elongation factor b (P-TEFb), which is composed of cyclin-dependent kinase 9 (CDK9) and cyclin-T (CycT), with potential antineoplastic activity. Upon administration, atuveciclib binds to and inhibits the activity of P-TEFb, thereby preventing the phosphorylation of its downstream target, the carboxyl terminal domain (CTD) of RNA polymerase II (RNA Pol II), and inhibiting the activation of transcriptional elongation by RNA Pol II. This prevents the transcription of tumor promoting genes, induces tumor cell apoptosis, and inhibits tumor cell proliferation. P-TEFb plays an important role in the regulation of gene transcription; over-activation in cancer cells leads to both the transcription of key tumor-promoting genes and cancer cell proliferation.
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