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.
Forrest J, Miller-Rushing AJ.Forrest J, et al.Philos Trans R Soc Lond B Biol Sci. 2010 Oct 12;365(1555):3101-12. doi: 10.1098/rstb.2010.0145.Philos Trans R Soc Lond B Biol Sci. 2010.PMID: 20819806Free PMC article.
Willis CG, Ruhfel B, Primack RB, Miller-Rushing AJ, Davis CC.Willis CG, et al.Proc Natl Acad Sci U S A. 2008 Nov 4;105(44):17029-33. doi: 10.1073/pnas.0806446105. Epub 2008 Oct 27.Proc Natl Acad Sci U S A. 2008.PMID: 18955707Free PMC article.