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.
Young JD, Liu CC, Butler G, Cohn ZA, Galli SJ.Young JD, et al.Proc Natl Acad Sci U S A. 1987 Dec;84(24):9175-9. doi: 10.1073/pnas.84.24.9175.Proc Natl Acad Sci U S A. 1987.PMID: 3321069Free PMC article.
Danet GH, Luongo JL, Butler G, Lu MM, Tenner AJ, Simon MC, Bonnet DA.Danet GH, et al.Proc Natl Acad Sci U S A. 2002 Aug 6;99(16):10441-5. doi: 10.1073/pnas.162104799. Epub 2002 Jul 24.Proc Natl Acad Sci U S A. 2002.PMID: 12140365Free PMC article.