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.
Grass S, Xu IS, Wiesenfeld-Hallin Z, Xu XJ.Grass S, et al. Among authors: xu xj, xu is.Neurosci Lett. 2002 May 24;324(3):197-200. doi: 10.1016/s0304-3940(02)00201-x.Neurosci Lett. 2002.PMID: 12009522