Blood usually falls into a few widely recognized categories or types, based on the proteins that are expressed on the surface of red blood cells. For example, A or B antigens may be present there, ...

Human blood already comes in a bewildering variety of types, but researchers have now identified a new one so rare that only three people on the planet are known to carry it. The finding exposes just ...

More than 92,000 patients in the United States are on the waiting list for a kidney transplant, and according to the Health Resources & Services Administration, 13 people die each day while waiting ...