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.
Sun C, Warland DK, Ballesteros JM, van der List D, Chalupa LM.Sun C, et al. Among authors: chalupa lm.Proc Natl Acad Sci U S A. 2008 Sep 9;105(36):13638-43. doi: 10.1073/pnas.0807178105. Epub 2008 Aug 29.Proc Natl Acad Sci U S A. 2008.PMID: 18757739Free PMC article.