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 JS, Brachmann CB, Celic I, Kenna MA, Muhammad S, Starai VJ, Avalos JL, Escalante-Semerena JC, Grubmeyer C, Wolberger C, Boeke JD.Smith JS, et al.Proc Natl Acad Sci U S A. 2000 Jun 6;97(12):6658-63. doi: 10.1073/pnas.97.12.6658.Proc Natl Acad Sci U S A. 2000.PMID: 10841563Free PMC article.