DNA

DNA's well-known structure has an alter ego, at least for 1 percent of the time. Sure, DNA can flex, bend and occasionally even switch from a right-handed to a left-handed double helix. But now scientists have seen a new state of DNA in which certain pieces (bases) are flipped 180 degrees, breaking the normal rules. This "excited state" of DNA could contain a whole new level of genetic information, the scientists say. Read more. Link to external Web site

Featured in the February 16, 2011, issue of Biomedical Beat.