Repair proteins wrapped around a DNA double helix. These proteins prevent DNA damage from accumulating and causing cell death. (Source: NIGMS, Credit: Tom Ellenberger, Washington University School of Medicine in St. Louis and Dave Gohara, Saint Louis University School of Medicine)
This image shows telomeres (yellow), protective caps on the ends of chromosomes, moving to the outer edge of a cell's nucleus (blue). Salk researchers found that the telomeres anchor to the nuclear envelope after the cell duplicates its DNA during division, which may help organize the chromosomes as the cell splits into two daughter cells.
Looking uncannily like a collection of sushi, in fact this is a closeup of Smallpox viruses. The virus consists of genetic material (red), DNA (deoxyribonucleic acid), enclosed by a protein capsid (coat, yellow)