Positive Transcriptional Elongation Factor B

**Definition:** A transcriptional elongation factor complex that is comprised of a heterodimer of CYCLIN-DEPENDENT KINASE 9 and one of several CYCLINS including TYPE T CYCLINS and cyclin K. It functions by phosphorylating the carboxy-terminal domain of RNA POLYMERASE II.

**Tree numbers:** - D08.811.913.696.620.682.700.626 - D12.776.476.563.626 - D12.776.930.955.500

**Synonyms:** - P-TEFb - tat-Associated Kinase - Positive Transcription Elongation Factor B