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    On 14/06/2012 5:47 PM, Shima Arasteh wrote:
    <blockquote
      cite="mid:1339660049.64436.YahooMailNeo@web36402.mail.mud.yahoo.com"
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        <div><span>Dear gmx friends,</span></div>
        <div><br>
          <span></span></div>
        <div><span>I put a protein in a simulation box filled of water
            molecules and entered the mdrun command. After the
            simulation, I found the protein near one of the edges of the
            box and not in center. What is the problem? Anyone may
            suggest me? <br>
          </span></div>
        <div><span>Does it mean that the simulation is meaningless? <br>
          </span></div>
        <div><span>I expect the protein to stay in the center of box and
            goes unfold by passing the time.<br>
          </span></div>
        <br>
      </div>
    </blockquote>
    See <a
href="http://www.gromacs.org/Documentation/Terminology/Periodic_Boundary_Conditions">http://www.gromacs.org/Documentation/Terminology/Periodic_Boundary_Conditions</a><br>
    <br>
    Mark<br>
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