 Today, the Search & Match Service of WMDA is the world's largest hematopoietic cell database, listing more than 30 million stem cell donors and over 750,000 cord blood units.WMDA participants consist of 75 hematopoietic cell donor registries from 53 countries, and 53 cord blood banks from 36 countries.For further details on the number of Donors/Cord Blood Units (CBU) per registry within the BMDW database click here.