Hi Archie,

Information on the chromosomes are found on the gateway pages (
http://genome.ucsc.edu/cgi-bin/hgGateway) for each assembly. Select the
assembly that you are interested in using the drop downs and then scroll
down the page. For hg19, there is a section called "Chromosome naming
scheme" which should have all the information to answer your questions.

If you have further questions, please email the list: [email protected].

Vanessa Kirkup Swing
UCSC Genome Bioinformatics Group


---------- Forwarded message ----------
From: Archie Russell <[email protected]>
Date: Tue, Mar 20, 2012 at 11:57 AM
Subject: [Genome] chr Un, random, gl, etc
To: [email protected]


Hi,

Can you tell me what the difference is between  "random",  "Un",  and
"gl*" chromosomes?

"Un" seems to be "unknown"  but then what is "random"?      What
would be a good way to describe chrUn_gl000211?

Are these chromosomes alternate assemblies due to actually genetic
differences
between individuals,  or would they exist even if just one person were
sequenced?

Thanks,
Archie
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