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<h2> 2.3 The Simplified Force Field</h2>
The "mm2gp" type project is for simplified protein models<a
href="references.html#ra">[1]</a>.
<p>Protein molecules are modelled using 1-3 "virtual atoms" per amino acid
residue in this kind of model. Several chains and disulphide brides are
supported, but non-natural amino acids are not. Files can be imported in
the PDB file format. The force field is fully functional with an initial parameter
set, and algorithms for geometry optimization and molecular dynamics are
available. </p>
<p>There are no sophisticated tools for model building yet, but they might
be coming later. </p>
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<h3> </h3>
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