Enzyme repairing DNA
Like a watch wrapped around a wrist, a special enzyme encircles the double helix to repair a broken strand of DNA. Without molecules that can mend such breaks, cells can malfunction, die, or become cancerous.
See also Image 2330 at images.nigms.nih.gov/index.cfm?event=viewDetail&image...
Courtesy of Tom Ellenberger, Washington University School of Medicine in St. Louis, and Dave Gohara, Saint Louis University School of Medicine
NIH funding from: National Institute of General Medical Sciences (NIGMS)