First we had genetically modified tobacco. After that, a host of vegetables and fruits went GMO. It seems that scientists intend to leave no gene unturned in their quest to improve upon everything that possesses DNA. Now they've upped the ante, moving from the vegetable kingdom to the animal. That's right: the latest development in GMO science is the genetically modified cow. According to a report in The Proceedings of the National Academy of Scientists, GMO cows were developed to perk up the biblical version by producing milk that's free of allergens. Jon Barron discusses these genetically modified cows producing this allergen-free human milk.