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.
ASTWOOD EB, BARRETT RJ, FRIESEN H.ASTWOOD EB, et al. Among authors: friesen h.Proc Natl Acad Sci U S A. 1961 Oct 15;47(10):1525-30. doi: 10.1073/pnas.47.10.1525.Proc Natl Acad Sci U S A. 1961.PMID: 13863037Free PMC article.No abstract available.
Posner BI, Kelly PA, Friesen HG.Posner BI, et al. Among authors: friesen hg.Proc Natl Acad Sci U S A. 1974 Jun;71(6):2407-10. doi: 10.1073/pnas.71.6.2407.Proc Natl Acad Sci U S A. 1974.PMID: 4366766Free PMC article.
Newman CB, Cosby H, Friesen HG, Feldman M, Cooper P, De Crescito V, Pilon M, Kleinberg DL.Newman CB, et al. Among authors: friesen hg.Proc Natl Acad Sci U S A. 1987 Nov;84(22):8110-4. doi: 10.1073/pnas.84.22.8110.Proc Natl Acad Sci U S A. 1987.PMID: 3479780Free PMC article.