This family photo shows D.J. Ferguson initially being treated at Milford, Mass., Regional Medical Center. Brigham and Women's Hospital in Boston is defending itself after Ferguson's family claimed he was denied a new heart for refusing to be vaccinated against COVID-19. Tracey Ferguson file photo/via AP hide caption
Fiancee Jessica Paker looks on as Ret. Marine Sgt. John Peck works with occupational therapist Meredith Grinnell. Peck, who was injured in Afghanistan in 2010, recently received a double arm transplant after a two-year wait on a transplant list. The Washington Post/Getty Images hide caption
A team of Cleveland Clinic transplant surgeons and gynecological surgeons perform the nation's first uterus transplant during a nine-hour surgery in Cleveland last month. AP hide caption
A team of Cleveland Clinic transplant surgeons and gynecological surgeons perform the nation's first uterus transplant during a nine-hour surgery in Cleveland. AP hide caption
Kevin Lopez at home in Greenbelt, Md. Meredith Rizzo/NPR hide caption
Dr. Mats Brannstrom and his team perform a womb transplant operation in April. Brannstrom says they delivered a healthy baby boy to a uterine transplant recipient last month, a first in medical science. Johan Wingborg/AP hide caption
Hospitals and organ banks could get more leeway in decisions about donations. Sean Gallup/Getty Images hide caption
Starting a bone marrow registry in Nigeria "became an obsession" for Seun Adebiyi. "I thought that even if I couldn't find a match, I wanted to make it easier for other black patients to find a match." Seun Adebiyi hide caption
Charla Nash received a full-face transplant after she was mauled by a chimpanzee in 2009. HO/AFP/Getty Images hide caption
A surgical team performs a full face transplant on Charla Nash at the Brigham and Women's Hospital in Boston. Lightchaser Photography hide caption