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.
Swanstrom R, Parker RC, Varmus HE, Bishop JM.Swanstrom R, et al.Proc Natl Acad Sci U S A. 1983 May;80(9):2519-23. doi: 10.1073/pnas.80.9.2519.Proc Natl Acad Sci U S A. 1983.PMID: 6302692Free PMC article.
Swanstrom R, DeLorbe WJ, Bishop JM, Varmus HE.Swanstrom R, et al.Proc Natl Acad Sci U S A. 1981 Jan;78(1):124-8. doi: 10.1073/pnas.78.1.124.Proc Natl Acad Sci U S A. 1981.PMID: 6264426Free PMC article.