Close-up of an ampoule that contains a medium for stem cell storage at the UK Stem Cell Bank, north London, England, May 19, 2004. (Photo by Peter Macdiarmid/Getty Images)
Close-up of an ampoule that contains a medium for stem cell storage at the UK Stem Cell Bank, north London, England, May 19, 2004. (Photo by Peter Macdiarmid/Getty Images)
