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.
Fynan EF, Webster RG, Fuller DH, Haynes JR, Santoro JC, Robinson HL.Fynan EF, et al.Proc Natl Acad Sci U S A. 1993 Dec 15;90(24):11478-82. doi: 10.1073/pnas.90.24.11478.Proc Natl Acad Sci U S A. 1993.PMID: 8265577Free PMC article.