http://www.amazon.in/p53-Gene-that-Cracked-Cancer/dp/1472910516 Day 313 has 216 protein-coding genes (browser view) including TP53 (tumor protein p53).
p53 is one of the most studied genes because of its critical role in guarding the genome against mutation and cancer.
Elephants were recently found to carry 20 copies of p53, which may explain their resistance to cancer.
Click here to see all 8325744 letters of Day 313 with TP53 underlined.