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 United States Penitentiary, Tucson is a high-security United States federal prison for male inmates in Arizona. It is part of the Tucson Federal Correctional Complex and is operated by the Federal Bureau of Prisons, a division of the United States Department of Justice. The facility also has a satellite prison camp for minimum-security male offenders. USP Tucson is located within Tucson's city limits, 10 miles southeast of downtown Tucson.