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.
Sutter G, Moss B.Sutter G, et al. Among authors: moss b.Proc Natl Acad Sci U S A. 1992 Nov 15;89(22):10847-51. doi: 10.1073/pnas.89.22.10847.Proc Natl Acad Sci U S A. 1992.PMID: 1438287Free PMC article.