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.
Campana D, Janossy G, Coustan-Smith E, Amlot PL, Tian WT, Ip S, Wong L.Campana D, et al.J Immunol. 1989 Jan 1;142(1):57-66.J Immunol. 1989.PMID: 2783327