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.
Grigorova M, Natarajan AT.Grigorova M, et al. Among authors: natarajan at.Mutat Res. 1998 Aug 3;404(1-2):67-75. doi: 10.1016/s0027-5107(98)00096-7.Mutat Res. 1998.PMID: 9729283