This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
BRD4 is required for stimulating kinase activity of 
Select and explain. 
A. P-TEFB, B. HEXIMI, C. HOX-B, D. TSKsnRNA
A: P-TEFB
Answer: A: P-TEFB 
Explanation: Ans: A P-TEFBBromodomain-containing protein 4 is a protein that in humans is encoded by the BRD4 gene.The C-terminal domain of BkD4 has been implicated in promoting gene transcription through interaction with the transcription elongation factor P-TEFb.