Researchers in Japan are exploring a future where the body itself becomes a health monitor, no screens or batteries required. A joint team from Tokyo City University and the University of Tokyo, working with scientists at RIKEN and engineers from Canon Medical Systems Co., has developed an experimental skin graft that visibly responds to inflammation inside the body. The work, published in the journal Nature Communications, describes a living sensor made from engineered human skin cells that glow when specific immune signals rise. The project is led by Distinguished Professor Hiroyuki Fujita of Tokyo City University, who is also a professor emeritus at the University of Tokyo, alongside Professor Shoji Takeuchi of the University of Tokyo. Their goal was to move beyond wearable devices that sit on the skin and instead build a monitoring system that becomes part of the body. “Conventional approaches are often invasive or provide only snapshots in time,” Fujita said. “Our goal was to explore a biologically integrated system that enables continuous sensing and intuitive interpretation, even at home.” Japanese researchers …