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.
Slatkin M, Racimo F.Slatkin M, et al.Proc Natl Acad Sci U S A. 2016 Jun 7;113(23):6380-7. doi: 10.1073/pnas.1524306113. Epub 2016 Jun 6.Proc Natl Acad Sci U S A. 2016.PMID: 27274045Free PMC article.