Figure 1.

The overall shape of the atomistic structure (top left) of IgG is converted into a volume mesh (bottom right). Schematic (top right): the torsional force is exerted on the molecule at the bottom (red shaded area), and the protein is fixed at the ends of the top branches (yellow shaded areas) to mimic the fixation to a substrate. The torsion axis and rotation direction are indicated. To see this figure in color, go online.