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 most notable facility in the federal prison system is Florence ADX, the federal supermax prison in Florence, Colorado, which holds inmates who are considered the most dangerous and in need of the tightest controls. USP Atlanta, USP Leavenworth, USP Lompoc, and USP Marion are medium-security facilities.