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.
Dillingham MS, Soultanas P, Wiley P, Webb MR, Wigley DB.Dillingham MS, et al.Proc Natl Acad Sci U S A. 2001 Jul 17;98(15):8381-7. doi: 10.1073/pnas.131009598.Proc Natl Acad Sci U S A. 2001.PMID: 11459979Free PMC article.