A human plasma cell. =============================================================== For the millions of us plagued by hypersensitive, overactive, or downright abusive immune systems, it can feel like you're constantly fighting your own physical self. From incessant allergies to life-threatening anaphylaxis and debilitating autoimmune disease, the system that's supposed to be protecting us can be problematic when it goes wrong. Now, we might be closer to fixing these issues in an entirely new way. Using transgenic mice and cultures of cells taken from human tonsils, researchers have now found evidence of how our bodies might defend against the mistakes that result in conditions such as...