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.
Rini JM, Stanfield RL, Stura EA, Salinas PA, Profy AT, Wilson IA.Rini JM, et al. Among authors: stanfield rl.Proc Natl Acad Sci U S A. 1993 Jul 1;90(13):6325-9. doi: 10.1073/pnas.90.13.6325.Proc Natl Acad Sci U S A. 1993.PMID: 8327513Free PMC article.