First off, there is more than one kind of stem cell. Human stem cells are unique because they have the potential to become a specialized cell and can divide and renew themselves, according to the National Institutes of Health.
Doing Time as a Federal Prison: 1934-63. In 1933, the Army relinquished Alcatraz to the U.S. Justice Department, which wanted a federal prison that could house a criminal population too difficult or dangerous to be handled by other U.S. penitentiaries.
The tour of Alcatraz departs daily from Fisherman's Wharf in San Francisco. Alcatraz was used as a federal maximum security prison from 1934 until 1963, when it was closed due to high costs and security issues.