This directory contains alignments of the chicken assembly 
(galGal2, Feb. 2004) to the mouse assembly (mm5, May 2004).

Files included in this directory:

  - axtNet directory: contains chained and netted alignments, i.e. the
    best chains in the genome, with gaps in the best chains filled in 
    by next-best chains where possible. 

  - chicken.chain.zip: chained blastz alignments. The chain format is 
    described in http://genome.ucsc.edu/goldenPath/help/chain.html.

  - chicken.net.zip: "net" file that describes rearrangements between the 
    species and the best chicken match to any part of the mouse genome.  
    The net format is described in 
    http://genome.ucsc.edu/goldenPath/help/net.html.

  - chickenSyn.net.zip: 

  - md5sum.txt: checksums of the files in this directory

The files in the axtNet directory are in "axt" format. For a description, 
see http://genome.ucsc.edu/goldenPath/help/axt.html.

The alignments were produced by the blastz alignment program, which 
is available from Webb Miller's lab at Penn State University 
(http://www.bx.psu.edu/miller_lab/). The blastz scoring matrix used was:

          A    C    G    T
    A    91  -90  -25 -100
    C   -90  100 -100  -25
    G   -25 -100  100  -90
    T  -100  -25  -90   91

with a gap open penalty of 400 and a gap extension penalty of 30.  The 
minimum score for an alignment to be kept was 10,000 for the first pass  
and 2200 for the second pass, which restricted the search space to the 
regions between two alignments found in the first pass.

Each chromosome was divided into 10,010,000 base chunks with 10,000 bases
of overlap. The .lav format blastz output, which does not include
the sequence, was converted to .axt with lavToAxt. 

The axtNet alignments were processed with chainNet, netSyntenic,
and netClass written by Jim Kent at UCSC.

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If you plan to download a large file or multiple files from this 
directory, we recommend that you use ftp rather than downloading 
the files via our website. To do so, ftp to hgdownload.cse.ucsc.edu, 
then go to the directory goldenPath/mm5/vsGalGal2. To download 
multiple files, use the "mget" command:

    mget <filename1> <filename2> ...
    - or -
    mget -a (to download all the files in the directory) 

All the files in this directory are freely usable for any 
purpose. The chicken sequence is made freely available before scientific 
publication with the following understanding: 

1. The data may be freely downloaded, used in analyses, and repackaged 
   in databases. 
2. Users are free to use the data in scientific papers analyzing 
   particular genes and regions if the providers of these data are 
   properly acknowledged. See http://genome.ucsc.edu/goldenPath/credits.html
   for credit information.
3. The centers producing the data reserve the right to publish the initial
   large-scale analyses of the data set, including large-scale 
   identification of regions of evolutionary conservation and large-scale 
   genomic assembly.  Large-scale refers to regions with size on the order 
   of a chromosome (that is, 30 Mb or more). 
4. Any redistribution of the data should carry this notice. 

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References

Chiaromonte, F., Yap, V.B., and Miller, W.  Scoring pairwise genomic 
sequence alignments.  Pac Symp Biocomput 2002;115-26.

Kent, W.J., Baertsch, R., Hinrichs, A., Miller, W., and Haussler, D. 
Evolution's cauldron: Duplication, deletion, and rearrangement in the 
mouse and human genomes.  Proc Natl Acad Sci USA 100(20):11484-11489 
Sep 30 2003.

Schwartz, S., Kent, W.J., Smit, A., Zhang, Z., Baertsch, R., Hardison, R., 
Haussler, D., and Miller, W.  Human-mouse alignments with BLASTZ</A>. 
Genome Res. 13(1):103-7 (2003).
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