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.
Buchholz UJ, Bukreyev A, Yang L, Lamirande EW, Murphy BR, Subbarao K, Collins PL.Buchholz UJ, et al.Proc Natl Acad Sci U S A. 2004 Jun 29;101(26):9804-9. doi: 10.1073/pnas.0403492101. Epub 2004 Jun 21.Proc Natl Acad Sci U S A. 2004.PMID: 15210961Free PMC article.