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Looks for voids at protein/protein interfaces using Will Sheffler's packstat. The number reported is the difference in the holes score between bound/unbound conformations. Be sure to set the -holes:dalphaball option (and to compile the corresponding executable in source/external/DAlpahBall)!
<InterfaceHoles name="(&string)" jump="(1 &integer)" threshold="(200 &integer)"/>