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.
López-García P, Philippe H, Gail F, Moreira D.López-García P, et al. Among authors: moreira d.Proc Natl Acad Sci U S A. 2003 Jan 21;100(2):697-702. doi: 10.1073/pnas.0235779100. Epub 2003 Jan 9.Proc Natl Acad Sci U S A. 2003.PMID: 12522264Free PMC article.