The cause of around 50% of people admitted to MIT having SAT’s above 1400 is that those without high test scores are eliminated from consideration.
Why is p53 mutating? Because mutation can and does happen.
Why are those cancers that grow and survive more likely to have p53 mutated? Because a functional p53 gene kills growing cancer cells.
p53 is not part of the immune system. The gene is expressed in every cell line.
*Slaps hand against forehead*
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