Which of the following statements regarding cyclin D is false?
a. It is required for cell cycle progression.
b. It is activated by growth factors.
c. It is always present and its activity is regulated by fluctuating levels of Cdk4 and Cdk6.
d. It is rapidly degraded following removal of appropriate growth factors.
Ans: c. It is always present and its activity is regulated by fluctuating levels of Cdk4 and Cdk6.
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