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.
Smith J, Davidson EH.Smith J, et al.Proc Natl Acad Sci U S A. 2008 Dec 23;105(51):20089-94. doi: 10.1073/pnas.0806442105. Epub 2008 Dec 22.Proc Natl Acad Sci U S A. 2008.PMID: 19104065Free PMC article.
Smith J, Davidson EH.Smith J, et al.Proc Natl Acad Sci U S A. 2009 Oct 27;106(43):18291-6. doi: 10.1073/pnas.0910007106. Epub 2009 Oct 12.Proc Natl Acad Sci U S A. 2009.PMID: 19822764Free PMC article.
Smith J, Kraemer E, Liu H, Theodoris C, Davidson E.Smith J, et al.Dev Biol. 2008 Jan 15;313(2):863-75. doi: 10.1016/j.ydbio.2007.10.042. Epub 2007 Nov 9.Dev Biol. 2008.PMID: 18061160Free PMC article.