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.
Iason GR, O'Reilly-Wapstra JM, Brewer MJ, Summers RW, Moore BD.Iason GR, et al.Philos Trans R Soc Lond B Biol Sci. 2011 May 12;366(1569):1337-45. doi: 10.1098/rstb.2010.0236.Philos Trans R Soc Lond B Biol Sci. 2011.PMID: 21444308Free PMC article.