SEOUL, REPUBLIC OF KOREA:  A worker walks past rows of storage tanks containing cord blood at a storeroom of Cord Bank in Seoul, 12 March 2005. The storage tanks represent the world's largest inventory of cord blood, containing more than 60,000 units and increasing. Han Hoon, head of Seoul Cord Bank operated by Histostem, pioneered cord blood stem cell therapies to treat difficult diseases. AFP PHOTO/JUNG YEON-JE  (Photo credit should read JUNG YEON-JE/AFP via Getty Images)