Researchers from UC Berkeley raised a foot mouse in the laboratory. The basis of the whole limb was stem cells. The result was obtained the foot, reacting to electrical impulses.
Note, this is not the first experience of scientists for growing biological objects (organs and tissues) in the modern laboratory. Previously managed to create some semblance of liver, kidney, muscle tissue, nervous system.
Full limb consists of several types of tissues, including nerve fibers capable of conducting electrical impulses. Now scientists want to find out if the built-in limb nerves to grow into the tissue and begin to control the muscles.