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.
Stocker R, Hunt NH, Buffinton GD, Weidemann MJ, Lewis-Hughes PH, Clark IA.Stocker R, et al.Proc Natl Acad Sci U S A. 1985 Jan;82(2):548-51. doi: 10.1073/pnas.82.2.548.Proc Natl Acad Sci U S A. 1985.PMID: 3855565Free PMC article.