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.
Gould SE, Upholt WB, Kosher RA.Gould SE, et al. Among authors: upholt wb.Proc Natl Acad Sci U S A. 1992 Apr 15;89(8):3271-5. doi: 10.1073/pnas.89.8.3271.Proc Natl Acad Sci U S A. 1992.PMID: 1565618Free PMC article.