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.
Sauerborn M, Schellekens H.Sauerborn M, et al. Among authors: schellekens h.Curr Opin Biotechnol. 2009 Dec;20(6):715-21. doi: 10.1016/j.copbio.2009.10.007. Epub 2009 Nov 4.Curr Opin Biotechnol. 2009.PMID: 19892544Review.