A surgical team with Sahlgrenska University Hospital in Gothenburg, Sweden, performs the first mother-to-daughter uterine transplant. Johan Wingborg/University of Gothenburg hide caption

itoggle caption Johan Wingborg/University of Gothenburg

Amber Cooper lives in Modesto, Calif., with her 5-year-old son, Jaden, and her husband, Kevin. She had a liver transplant when she was 10 years old and has to take anti-rejection medication. Deanne Fitzmaurice for NPR hide caption

itoggle caption Deanne Fitzmaurice for NPR

All in the family: Nino Giarratano (left), the head baseball coach at the University of San Francisco, joins hands with his father, Mickey Giarratano, after the transplant of a kidney from son to father at Porter Adventist Hospital in Denver last year. AP/Courtesy Giarratano Family hide caption

itoggle caption AP/Courtesy Giarratano Family