Doctors are now one step closer to deploying sensors that can travel to parts of a patient's body to diagnose hard-to-detect conditions. From a report: Researchers have devised a new way to get a sneak peek into what's going on deep in your digestive system, creating a swallowable sensor that, with the help of engineered bacteria and a tiny electrical circuit, can detect the presence of molecules that might be signs of disease and then beam the results to a smartphone app. The device, which scientists validated in pigs, remains a prototype and needs to be refined before it could be used in people. But the researchers, who reported their work Thursday in the journal Science, combined innovations in synthetic biology and microelectronics to create a modular platform that could be adapted to identify a wide range of molecules. "We want to try to illuminate and provide understanding into areas that are not easily accessible," said Dr. Timothy Lu, a bioengineer at the Massachusetts Institute of Technology and senior author of the paper.