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.
Martin SE, Iandolo JJ.Martin SE, et al. Among authors: iandolo jj.J Bacteriol. 1975 Jun;122(3):1136-43. doi: 10.1128/jb.122.3.1136-1143.1975.J Bacteriol. 1975.PMID: 1150618Free PMC article.