In a reversal of long-standing policy, the U.S. Justice Department announced on Friday that naturally occurring genes—human or otherwise—could not be patented. This ruling does not include manipulated or altered genes. So, for instance, you can still patent the specific, fiddled-with genes behind a GM crop. But, this is still a very big deal. Right now the genes associated with increased risk of breast cancer are patented and, thus, there is only one, very expensive, test available to look for them. In March, a judge ruled those patents invalid. And now it looks like the federal government is backing up that ruling.