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.
Lauffer L, Hucho F.Lauffer L, et al. Among authors: hucho f.Proc Natl Acad Sci U S A. 1982 Apr;79(7):2406-9. doi: 10.1073/pnas.79.7.2406.Proc Natl Acad Sci U S A. 1982.PMID: 6285383Free PMC article.