Which of the following is an internal regulator of the cell cycle?

billy

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6. which of the following is an internal regulatoor of the cell cycle?
a, cyclins b. growth factors c. mitotic spindle d. cancer cells

7. what is an example of an external regulator of the cell cycle?
a. an accuulation of cyclins b. contact inhibitation c. helicase d. a defective p53 system
 
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