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From: claris!netcom!jfh@ames.arc.nasa.gov (Jack Hamilton)
Newsgroups: sci.med.aids
Subject: CD-4
Summary: Nomenclature trivia
Message-ID: <38253@shemp.CS.UCLA.EDU>
Date: 22 Aug 90 05:15:52 GMT
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Note:	Copyright 1990 by Daniel R. Greening.  Permission granted for
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I have wondered where the name "CD4" comes from, but I've never remember to
ask someone who knows.

I was reading the description of a drug called "Orthoclone" last night.
Orthoclone is an immunosuppressant and is used to help prevent graft
rejection by blocking the function of CD3 in T cells.

The description included this sentence: "The CD3 designation identifies the
specificity of the antibody as the Cell Differentiation (CD) cluster 3
defined by the First International Workshop on Human Leukocyte
Differentiation Antigens."

So now I know.
-- 
Because of mail/disk problems at Netcom, I have adopted the policy of
responding in some way to all non-listserv/non-acknowledgement email.  If
you don't hear from me, I didn't get it.
       Jack Hamilton    jfh@netcom.uucp   or   claris!netcom!jfh