In a major advance in custom-engineered body parts, a 56-year-old German man who lost his jaw to cancer grew a new one. Surgeon Patrick Warnke at the University of Kiel used computer-imaging software to fabricate a titanium-mesh mold that precisely matched the shape of the patient’s lost bone. Warnke then seeded the mold with bone stem cells from the man’s marrow and incubated it in his latissimus dorsi muscle, below the right shoulder blade. The marrow cells quickly filled the mesh with new bone. Seven weeks later, doctors surgically removed the mold and attached it to the remains of the cancer victim’s jaw. Four weeks after the operation, the patient (below)—who had only been able to slurp soft foods for the past nine years—was back on solids. “His first meal was a bratwurst,” Warnke says. “He really wanted that sausage.”