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.
Pagán I, Fraile A, Fernandez-Fueyo E, Montes N, Alonso-Blanco C, García-Arenal F.Pagán I, et al.Philos Trans R Soc Lond B Biol Sci. 2010 Jun 27;365(1548):1983-95. doi: 10.1098/rstb.2010.0062.Philos Trans R Soc Lond B Biol Sci. 2010.PMID: 20478893Free PMC article.