By the numbers Bone-marrow transplants

35,000: Approximate number of people in the U.S. who need bone-marrow transplants each year

25-30: Percentage of people who find matches within their families

10 million: Number of people on the interconnected marrow donor registries around the world

0.25: Percentage of people on the registry who get called to donate

Source: www.marrow.org

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