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.
Hempel J, Höög JO, Jörnvall H.Hempel J, et al.FEBS Lett. 1987 Sep 28;222(1):95-8. doi: 10.1016/0014-5793(87)80198-9.FEBS Lett. 1987.PMID: 3653404Free article.
Wessel H, Anderson S, Fite D, Halvas E, Hempel J, SundarRaj N.Wessel H, et al. Among authors: hempel j.Invest Ophthalmol Vis Sci. 1997 Oct;38(11):2408-22.Invest Ophthalmol Vis Sci. 1997.PMID: 9344363