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.
Do I actually get to go onto Alcatraz Island and into the prison? Yes, you are purchasing a tour package that includes the official ferry ticket and audio cell house tour operated by Alcatraz Cruises (the official government concessioner for Alcatraz tours).