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.
Lew AM, Kelly J.Lew AM, et al. Among authors: kelly j.Nucleic Acids Res. 1991 Jun 25;19(12):3459. doi: 10.1093/nar/19.12.3459.Nucleic Acids Res. 1991.PMID: 2062663Free PMC article.