Question: Which of the following about Rb tumor suppressor protein is correct?
Options
A : It binds E2F transcription factor and prevents cell from entering S phase until a mitogenic signal is received
B : It is activated when phosphorylated by Cdk
C : It is a transcription factor
D : When a mitogenic signal is received, it binds the transcription factor E2F and thus stimulates the cell to enter S phase
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