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.
Plow E, Edgington TS.Plow E, et al.Proc Natl Acad Sci U S A. 1972 Jan;69(1):208-12. doi: 10.1073/pnas.69.1.208.Proc Natl Acad Sci U S A. 1972.PMID: 4109598Free PMC article.
Plow EF, Edgington TS.Plow EF, et al.Proc Natl Acad Sci U S A. 1973 Apr;70(4):1169-73. doi: 10.1073/pnas.70.4.1169.Proc Natl Acad Sci U S A. 1973.PMID: 4123931Free PMC article.