[Genome] Question about SNPs that map to 2 genomic locations

[McHenry, Toby Helen]

Hi there,
 
I have been using the UCSC Genome and Table Browsers to get position
information on SNPs.  For several SNPs, I have encountered the situation
where the SNP maps to two genomic locations.  I was wondering if you can
explain what that means.
 
For instance, in the release July 2003, the SNP rs357564 has the
following hits:
 
rs357564 at chr9:93550753-93551253
<http://genome.ucsc.edu/cgi-bin/hgTracks?position=chr9:93550753-93551253
&hgsid=86516453&snp=pack&hgFind.matches=rs357564,> 
rs357564 at chr9_random:1960185-1960685
<http://genome.ucsc.edu/cgi-bin/hgTracks?position=chr9_random:1960185-19
60685&hgsid=86516453&snp=pack&hgFind.matches=rs357564,> 

The "chr9" bp position seems to line up with rs357564 bps in later
release information, while the "chr9_random" position does not.  So, I'm
confused about what that "chr9_random" position describes.
 
Thanks very much for any help you can offer,

Toby McHenry
School of Dental Medicine 
Suite 500 Cellomics Building 
100 Technology Drive 
Pittsburgh PA 15219 
412-383-8115 
tog1 at pitt.edu 

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