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.
Hannon K, Johnstone E, Craft LS, Little SP, Smith CK 2nd, Heiman ML, Santerre RF.Hannon K, et al. Among authors: craft ls.Anal Biochem. 1993 Aug 1;212(2):421-7. doi: 10.1006/abio.1993.1350.Anal Biochem. 1993.PMID: 8214583