You are presented with the question "One tumor suppressor protein which often results in cancer when it stops functioning is:" and the following answer choices: 
- gene
 - p53
 - tumors
 - HIV
 - enzyme
 - tRNA
 - DNA
 - TRH

Now knowing that cancer is a disease that occurs when the cell cycle is no longer regulated and another critical protein in regulating the cell cycle is the tumor suppressor protein p53 , choose the best answer.


 

  p53       