In this undated photo provided by the University of Michigan Health System, 

In this undated photo provided by the University of Michigan Health System, Scott Hollister, Ph.D., left, and Glenn Green, M.D., of the University of Michigan, pose for a photo. In a medical first, the doctors used plastic particles and a 3-D laser printer to create an airway splint to save the life of a baby boy who used to stop breathing nearly every day. It's the latest advance from the booming field of regenerative medicine, making body parts in the lab. (AP Photo/University of Michigan Health System)
Associated Press
In this undated photo provided by the University of Michigan Health System, Scott Hollister, Ph.D., left, and Glenn Green, M.D., of the University of Michigan, pose for a photo. In a medical first, the doctors used plastic particles and a 3-D laser printer to create an airway splint to save the life of a baby boy who used to stop breathing nearly every day. It's the latest advance from the booming field of regenerative medicine, making body parts in the lab. (AP Photo/University of Michigan Health System)
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