The American Association of Tissue Banks (AATB) is a professional, non-profit, scientific and educational organization. It is one of the only national tissue banking organizations in the United States, and its membership totals more than 125 accredited tissue banks and 2,000 individual members. These banks recover tissue from more than 30,000 donors and distribute in excess of two million allografts for more than 1.75 million tissue transplants performed annually in the U.S. The overwhelming majority of the human tissue distributed for these transplants comes from AATB-accredited tissue banks.