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.
Owen WF Jr, Petersen J, Sheff DM, Folkerth RD, Anderson RJ, Corson JM, Sheffer AL, Austen KF.Owen WF Jr, et al. Among authors: sheffer al.Proc Natl Acad Sci U S A. 1990 Nov;87(21):8647-51. doi: 10.1073/pnas.87.21.8647.Proc Natl Acad Sci U S A. 1990.PMID: 2236076Free PMC article.