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.
In early 1963, Attorney General Robert Kennedy ordered the closing of Alcatraz Penitentiary citing increasing maintenance and operational costs. The last convicts were removed from the island on March 21, 1963. When the island closed, it was replaced by a new maximum-security federal prison in Marion, Illinois.