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.
Chen FT, Pentoney SL Jr.Chen FT, et al. Among authors: pentoney sl jr.J Chromatogr A. 1994 Oct 7;680(2):425-30. doi: 10.1016/0021-9673(94)85139-5.J Chromatogr A. 1994.PMID: 7981824