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.
Hill A, Bloom K.Hill A, et al. Among authors: bloom k.Mol Cell Biol. 1989 Mar;9(3):1368-70. doi: 10.1128/mcb.9.3.1368-1370.1989.Mol Cell Biol. 1989.PMID: 2657392Free PMC article.