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For those with kidney failure, a transplant is often the greatest promise of a healthier, longer life. Yet thousands wait years for a match that never comes. Incompatibility of blood type is one of ...

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 ...

Transplanting organs is tricky business. If you need an organ, you can't receive a donation from just anybody; it follows the same rules as blood type compatibility. For example, someone with blood ...