Hollow helps to visualize and quantify voids, pockets, and channels in protein structures.
It generates fake atoms that fill space inside a structure specified in the PDB format. The output is a standard PDB file containing the fake atoms. The molecular surface of these atoms is an excellent approximation to the cavity and can be easily rendered in standard molecular visualization software such as PyMOL, VMD or Chimera.
In complements programs such as HOLE, CAVER, MOLE, SPHGEN, and CASTp.
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