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.
Simson E, Groner W.Simson E, et al.Cytometry. 1995 Mar 15;22(1):26-34. doi: 10.1002/cyto.990220106.Cytometry. 1995.PMID: 7587730Free article.Clinical Trial.