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.
The rest of this article is only available to subscribers.
© 2014 Augsburg Fortress, Publishers