Antibodies, manufactured by the body in response to specific threats called antigens, are good at sniffing out foreign or bacterial invaders. Antibody biosensors leverage this talent for locating antigens into a device medical and security personnel can use to detect threats. However, each antibody is pre-programmed to bind to a single antigen. But after some lab tinkering, antibodies can be manipulated to bind with several different antigens, and that's where Darpa sees potential. Create a single "super-antibody" that can bind with millions of antigens, and we could quickly have a biosensor that can identify and distinguish between all kinds of threats quickly and reliably.