The human gut is home to thousands of species of bacteria, and some of those bacteria have the potential to treat a variety of gastrointestinal diseases. Some species may help to combat colon cancer, while others could help treat or prevent infections such as C. difficile. One of the obstacles to developing these “living biotherapeutics” is that many of the species that could be beneficial are harmed by oxygen, making it difficult to manufacture, store, and deliver them. MIT chemical engineers have now shown that they can protect those bacteria…