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    I've attached the file<span class="Apple-style-span"
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    Il 23/09/2010 19:38, Eric Pettersen ha scritto:
    <blockquote
      cite="mid:F1A9F47E-64B9-4F71-9819-734003A5E399@cgl.ucsf.edu"
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      <div>
        <div>On Sep 23, 2010, at 6:33 AM, Francesco Oteri wrote:</div>
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          <div>Dear all,<br>
            I'd like to use chimera to do a picture of a circular DNA
            with ribbon <br>
            representation.<br>
            <br>
            I found the two following problems:<br>
            1.If I load the .pdb files, chimera is unable to recognize
            the topology <br>
            and shows extra-bond connecting the last base of a strand
            with the <br>
            previous of the other strand.<br>
          </div>
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        <div><br>
        </div>
        I would need the PDB file in order to see exactly what you mean
        here, and to fix the problem.</div>
      <div><br>
        <blockquote type="cite">
          <div>2.If I load the AMBER topology, the connectivity is
            correctly <br>
            recognized, but the first base and last are not connected by
            &nbsp;the ribbon.</div>
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        <br>
      </div>
      <div>This problem is marked as "fixed" in our bug database, but
        some simple testing shows that it is not. &nbsp;I have reopened that
        entry and will add you to the recipient list so that you will
        get notified when we fix it (hopefully for real!) again.</div>
      <div><br>
      </div>
      <div>--Eric</div>
      <br>
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            <p style="margin: 0px;"><font style="font: 16px Helvetica;"
                size="5" face="Helvetica"><span
                  class="Apple-converted-space">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span
                    class="Apple-converted-space">&nbsp;</span></span>Eric
                Pettersen</font></p>
            <p style="margin: 0px;"><font style="font: 16px Helvetica;"
                size="5" face="Helvetica"><span
                  class="Apple-converted-space">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span
                    class="Apple-converted-space">&nbsp;</span></span>UCSF
                Computer Graphics Lab</font></p>
            <p style="margin: 0px;"><font style="font: 16px Helvetica;"
                size="5" face="Helvetica"><span
                  class="Apple-converted-space">&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;</span><a
                  moz-do-not-send="true" href="http://www.cgl.ucsf.edu">http://www.cgl.ucsf.edu</a></font></p>
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