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.
Orr HA, Turelli M.Orr HA, et al. Among authors: turelli m.Evolution. 2001 Jun;55(6):1085-94. doi: 10.1111/j.0014-3820.2001.tb00628.x.Evolution. 2001.PMID: 11475044