Kevin Lopez at home in Greenbelt, Md. Meredith Rizzo/NPR hide caption

itoggle caption Meredith Rizzo/NPR

Hospitals and organ banks could get more leeway in decisions about donations. Sean Gallup/Getty Images hide caption

itoggle caption Sean Gallup/Getty Images

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

itoggle caption Seun Adebiyi