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.
Merchán-Pérez A, Rodriguez JR, Ribak CE, DeFelipe J.Merchán-Pérez A, et al.Proc Natl Acad Sci U S A. 2009 Jun 16;106(24):9878-83. doi: 10.1073/pnas.0900330106. Epub 2009 Jun 1.Proc Natl Acad Sci U S A. 2009.PMID: 19487685Free PMC article.