This option allows you to scan pairs of residues in two input residue selections that can be replaced by Cysteines forming a disulfide bridge. To do this:

• Read in a PDB structure.
• Select one or more chains using the regular green selection as well as the orange selection. If the second argument is empty it is assumed equal to the first selection.
• Tools/Design/Disulfide Bridges
• The procedure returns a table called CysBridges with possible pairs sorted by the strain associated with the bridge.