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.
Karsten U, Holzinger A.Karsten U, et al.Microb Ecol. 2012 Jan;63(1):51-63. doi: 10.1007/s00248-011-9924-6. Epub 2011 Aug 3.Microb Ecol. 2012.PMID: 21811791