Sketch of three of the elastic protein models assembled from hexagonally placed small beads. The beads are held together by harmonic springs between direct neighbours which are then propagated individually. In addition to the three sizes shown here we used a fourth protein built from 39 beads. As more and more beads are used the resulting particles get closer to a spherical shape.
Geyer BMC Biophysics 2011 4:7 doi:10.1186/2046-1682-4-7