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.
Rooney JE, Gurpur PB, Burkin DJ.Rooney JE, et al. Among authors: burkin dj.Proc Natl Acad Sci U S A. 2009 May 12;106(19):7991-6. doi: 10.1073/pnas.0811599106. Epub 2009 Apr 28.Proc Natl Acad Sci U S A. 2009.PMID: 19416897Free PMC article.