Team Solves Mystery Associated With DNA Repair, Howard Hughes Medical Institute Study  
12/14/2012 7:16:21 AM

Every time a human or bacterial cell divides it first must copy its DNA. Specialized proteins unzip the intertwined DNA strands while others follow and build new strands, using the originals as templates. Whenever these proteins encounter a break -- and there are many -- they stop and retreat, allowing a new cast of molecular players to enter the scene.