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.
Sirover MA, Loeb LA.Sirover MA, et al.Proc Natl Acad Sci U S A. 1976 Jul;73(7):2331-5. doi: 10.1073/pnas.73.7.2331.Proc Natl Acad Sci U S A. 1976.PMID: 1065882Free PMC article.