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.
Fields RC, Shimizu K, Mulé JJ.Fields RC, et al. Among authors: mule jj.Proc Natl Acad Sci U S A. 1998 Aug 4;95(16):9482-7. doi: 10.1073/pnas.95.16.9482.Proc Natl Acad Sci U S A. 1998.PMID: 9689106Free PMC article.
Shimizu K, Fields RC, Giedlin M, Mulé JJ.Shimizu K, et al. Among authors: mule jj.Proc Natl Acad Sci U S A. 1999 Mar 2;96(5):2268-73. doi: 10.1073/pnas.96.5.2268.Proc Natl Acad Sci U S A. 1999.PMID: 10051630Free PMC article.