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.
Liu X, Zhao J, Li F, Guo YS, Hellmich MR, Townsend CM Jr, Cao Y, Ko TC.Liu X, et al. Among authors: guo ys.Regul Pept. 2009 Nov 27;158(1-3):26-31. doi: 10.1016/j.regpep.2009.07.010. Epub 2009 Jul 23.Regul Pept. 2009.PMID: 19631696Free PMC article.