Some of Madison's most precious assets are deep-frozen in vials at University Research Park.
The National Stem Cell Bank, the country's only official repository of human embryonic stem cells, is housed at the WiCell Research Institute, a nonprofit organization affiliated with UW-Madison.
The bank was established three years ago to test, store and distribute the 21 lines, or colonies, of stem cells approved for federal funding. They include the world's first five lines, created by campus researcher James Thomson.