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.
Copeland WE, Wolke D, Lereya ST, Shanahan L, Worthman C, Costello EJ.Copeland WE, et al. Among authors: costello ej.Proc Natl Acad Sci U S A. 2014 May 27;111(21):7570-5. doi: 10.1073/pnas.1323641111. Epub 2014 May 12.Proc Natl Acad Sci U S A. 2014.PMID: 24821813Free PMC article.