An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Towe KM, Harper CW Jr.Towe KM, et al. Among authors: harper cw jr.Science. 1966 Oct 7;154(3745):153-5. doi: 10.1126/science.154.3745.153.Science. 1966.PMID: 17740105