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.
Glazer AN, Cohen-Bazire G, Stanier RY.Glazer AN, et al.Proc Natl Acad Sci U S A. 1971 Dec;68(12):3005-8. doi: 10.1073/pnas.68.12.3005.Proc Natl Acad Sci U S A. 1971.PMID: 4108869Free PMC article.