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.
Freed LE, Langer R, Martin I, Pellis NR, Vunjak-Novakovic G.Freed LE, et al. Among authors: langer r.Proc Natl Acad Sci U S A. 1997 Dec 9;94(25):13885-90. doi: 10.1073/pnas.94.25.13885.Proc Natl Acad Sci U S A. 1997.PMID: 9391122Free PMC article.