You are presented with the quiz "P16 is an example of what type of thing that causes cancer when it stops functiong properly?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "cancer is a disease that occurs when the cell cycle is no longer regulated" and "p16 is a regulator of the cell division cycle". 

So, what's the best answer to the question?


 

   gene        