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From: werner@aecom.UUCP (Craig Werner)
Newsgroups: sci.med
Subject: Re: sex and color
Message-ID: <599@aecom.UUCP>
Date: Fri, 14-Nov-86 02:20:37 EST
Article-I.D.: aecom.599
Posted: Fri Nov 14 02:20:37 1986
Date-Received: Sun, 16-Nov-86 01:18:31 EST
References: <2302@bucse.bu-cs.BU.EDU> <7858@tekecs.TEK.COM> <1229@cybvax0.UUCP>
Organization: Albert Einstein Coll. of Med., NY
Lines: 24
Summary: Sex Chromatin Bodies

In article <1229@cybvax0.UUCP>, mrh@cybvax0.UUCP (Mike Huybensz) writes:
> In article <7858@tekecs.TEK.COM> mikes@tekecs.TEK.COM (Michael Sellers) writes:
> > If I remember correctly, the second X chromosome in females sits unused in
> > the nucleus (it never "unbundles" in interphase like the rest of the 
> > chromosomes do).  These are called "Barr bodies", after the guy who 
> > discovered them.  

	When I took cytology, the professor, Leopold Koss, in a classic line,
enjoined us about the following:
	"These are sex chromatin bodies, not Barr bodies. Barr had a
collaborator [pause], whose name unfortunately escapes me at the time."

BTW, they are officially Barr-Bertram bodies, and they were first described
in the neurones of female cats.
	Also, it is thought that at least part of the 2nd X was active.
At one point, I knew the exact band. But it has to be so, otherwise
Turner's and Kleinfeldter's Syndrome patients would be normal, and they
are not.

-- 
			      Craig Werner (MD/PhD '91)
				!philabs!aecom!werner
              (1935-14E Eastchester Rd., Bronx NY 10461, 212-931-2517)
               "Why is it that half the calories is twice the price?"