This picture of wild-type barnase highlights in green the residues which were mutated in order to form the disulphide links. This pdb may be downloaded here: [Bbk|BNL|ExP|Waw|Hal].

This picture is of the 85 / 102 disulphide barnase mutant, which has the highest degree of stabilisation (cysteines in yellow). This pdb may be downloaded here: [Bbk|BNL|ExP|Waw|Hal].

This picture is of the 43 / 80 disulphide barnase mutant which, despite linking a longer loop, is less stabilising than the 85 / 102 mutant (cysteines in yellow). This pdb may be downloaded here: [Bbk|BNL|ExP|Waw|Hal].

Disulphide Bonds