The chances for curing a fatal blood disease like Bill Lutholtz' leukemia improve with every volunteer added to a bone marrow donor registry. That's because matching bone marrow types is much more complex than matching blood types. We're used to thinking about the four blood types--A, AB, B and O--that are common to all people. But each person's bone marrow type is a mix of six antigen factors, three from each parent, that combine in myriad ways resulting in millions of tissue types. Matches between races are rare.
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