Mobilizing the repair squad: Critical protein helps mend damaged DNA

Mobilizing the repair squad: Critical protein helps mend damaged DNA  
http://www.eurekalert.org/pub_releases/2009-12/si-mtr121709.php  
 
"The DNA in our cells is under constant attack from reactive chemicals generated as byproducts of cellular metabolism. In addition, it is assaulted by x-rays, ultraviolet radiation from the sun, and environmental carcinogens such as tobacco smoke. As a result of this continuous bombardment, some studies have estimated that the DNA in a single human cell gets damaged over 10,000 times every day."