Dr. Anthony Atala holds the "scaffolding" for a human kidney created by a 3-D printer in a laboratory at Wake Forest University in Winston-Salem, N.C., on Wednesday, May 8, 2013. The university is experimenting with various ways to create replacement organs for human implantation, from altering animal parts to building them from scratch with a patient's own cells. (AP Photo/Allen Breed)

Associated Press
Dr. Anthony Atala holds the "scaffolding" for a human kidney created by a 3-D printer in a laboratory at Wake Forest University in Winston-Salem, N.C., on Wednesday, May 8, 2013. The university is experimenting with various ways to create replacement organs for human implantation, from altering animal parts to building them from scratch with a patient's own cells. (AP Photo/Allen Breed)
Dr. Anthony Atala holds the "scaffolding" for a human kidney created by a 3-D printer in a laboratory at Wake Forest University in Winston-Salem, N.C., on Wednesday, May 8, 2013. The university is experimenting with various ways to create replacement organs for human implantation, from altering animal parts to building them from scratch with a patient's own cells. (AP Photo/Allen Breed)
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