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.
Gross BL, Zhao Z.Gross BL, et al.Proc Natl Acad Sci U S A. 2014 Apr 29;111(17):6190-7. doi: 10.1073/pnas.1308942110. Epub 2014 Apr 21.Proc Natl Acad Sci U S A. 2014.PMID: 24753573Free PMC article.