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    I recently reviewed the way Ensembl fetches and renders sequence
    regions and discovered that labels like 'chromosome' and 'contig'
    are fixed, not configurable, and rendered in one particular way as a
    track (on pages with tracks displayed). The sequence region track
    has the fixed label 'Contigs'. It displays your sequence level
    (lowest rank) coordinate system in alternating blue shaded regions
    and allows you to navigate by pop-up menu to a region centered on
    the contig.  <br>
    -Jay<br>
    <br>
    On 06/08/2012 11:39, PATERSON Trevor wrote:
    <blockquote
cite="mid:4B2DE8422AF25D40820C088EF2AE5D271F5420D146@EXSEEDMD.is.ed.ac.uk"
      type="cite">
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        <p class="MsoNormal">Could someone clarify the significance of
          naming a top-level coordinate-system as ‘group’ rather than
          ‘chromosome’?<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">There is one species (stickleback) in
          Ensembl that has a top-ranked coordinate system called
          ‘group’, rather than ‘chromosome’.<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">There is a karyotype page for stickleback
          and these ‘groups’ are described as chromosomes: there is no
          indication of what significance the name ‘group’ has.<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">I cannot find any other coordinate system
          called ‘group’, but in EnsemblGenomes the top ranked
          coord-system of  Drosophila pseudoobscura is named ‘chr-group’
          but these do not seem to treated as chromosomes/karyotypes by
          the web interface.<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">I don’t think there is an enumeration of
          allowed coordinate-system names, with definitions  - maybe
          there could be?<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">cheers<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">trevor<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal"
          style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span
style="font-size:12.0pt;font-family:"Arial","sans-serif";color:navy;mso-fareast-language:EN-GB">Trevor
              Paterson PhD<br>
            </span></b><span
style="font-size:12.0pt;font-family:"Arial","sans-serif";color:navy;mso-fareast-language:EN-GB"><a
              moz-do-not-send="true"
              href="mailto:trevor.paterson@roslin.ed.ac.uk"><span
                style="color:blue">trevor.paterson@roslin.ed.ac.uk</span></a></span><span
            style="font-size:12.0pt;font-family:"Times New
            Roman","serif";mso-fareast-language:EN-GB"><o:p></o:p></span></p>
        <p class="MsoNormal"
          style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:12.0pt;font-family:"Arial","sans-serif";color:navy;mso-fareast-language:EN-GB">Bioinformatics
            <br>
            The Roslin Institute<br>
            Royal (Dick) School of Veterinary Studies<br>
            University of Edinburgh<br>
            Easter Bush<br>
            Midlothian<br>
            EH25 9RG<br>
            Scotland UK<br>
            <br>
            phone +44 (0)131 651 9157<br>
            <br>
            <a moz-do-not-send="true"
              href="http://bioinformatics.roslin.ed.ac.uk/"><span
                style="color:blue">http://bioinformatics.roslin.ed.ac.uk/</span></a></span><span
            style="font-size:12.0pt;font-family:"Times New
            Roman","serif";color:black;mso-fareast-language:EN-GB"><br>
          </span><span style="font-size:10.0pt;font-family:"Times
            New
            Roman","serif";color:navy;mso-fareast-language:EN-GB"><br>
          </span><span
style="font-size:12.0pt;font-family:"Arial","sans-serif";color:green;mso-fareast-language:EN-GB">Please
            consider the environment before printing this e-mail</span><span
            style="font-size:12.0pt;font-family:"Times New
            Roman","serif";mso-fareast-language:EN-GB"><o:p></o:p></span></p>
        <p class="MsoNormal"
          style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><i><span
              style="font-size:10.0pt;font-family:"Times New
              Roman","serif";color:navy;mso-fareast-language:EN-GB">The
              University of Edinburgh is a charitable body, registered
              in Scotland with registration number SC005336</span></i><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy;mso-fareast-language:EN-GB"><br>
            <b>Disclaimer:This e-mail and any attachments are
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            style="font-size:12.0pt;font-family:"Times New
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        <p class="MsoNormal"><o:p> </o:p></p>
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      <br>
      <pre wrap="">The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.
</pre>
      <br>
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      <br>
      <pre wrap="">_______________________________________________
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</pre>
    </blockquote>
    <br>
    <pre class="moz-signature" cols="72">-- 
Jay Humphrey                   Ensembl Genomes Web Developer
EMBL-EBI                       Tel: +44-(0)1223-492682
Wellcome Trust Genome Campus   Fax: +44-(0)1223-494468
Cambridge CB10 1SD, UK         <a class="moz-txt-link-freetext" href="http://www.ensemblgenomes.org/">http://www.ensemblgenomes.org/</a> </pre>
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