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.
Grau GE, Heremans H, Piguet PF, Pointaire P, Lambert PH, Billiau A, Vassalli P.Grau GE, et al. Among authors: vassalli p.Proc Natl Acad Sci U S A. 1989 Jul;86(14):5572-4. doi: 10.1073/pnas.86.14.5572.Proc Natl Acad Sci U S A. 1989.PMID: 2501793Free PMC article.