Researchers can grow small of pieces of human liver tissue but haven't developed the the technology to use this tissue for transplants. Doctors reconstruct nerves damaged by disease or injury using pig nerve cells cultivated in laboratories. Artificial nerves will be made from synthetic material called polymers.
Doctors replace legs and arms with prosthetic, or artificial, limbs.
Doctors inject hormones, chemicals that affect body functions, into fractured jaws and other bones to help them regenerate or regrow. As cells multiply, scaffolds will slowly dissolve. The new skin heals severe burns and other injuries. But the human immune system often rejects the foreign cells. So patients must take anti-rejection drugs, which may have serious side effects.