An optic fiber emitting infrared light from a diode laser has been placed just one millimeter away from the developing heart of a two-day old quail embryo. As the laser pulse changes its speed, the heart alters its beat to match. This system is the first time that the whole heart of a living animal has been paced with light–a method that could yield insight into the development of heart defects as well as, much further down the road, provide a new approach for building
Scientists at Massachusetts General Hospital are building new livers by using old, unhealthy ones that would normally be discarded. The scientists use a gentle detergent to wash away old cells and debris. The remaining scaffold, which retains its blood-vessel architecture, can then be seeded with healthy liver cells and transplanted into a living animal.