The DelBond command deletes all bonds between the two atom selections.

The easiest way to delete a bond manually is by marking two bound atoms like when measuring a distance, and then clicking 'Delete > Bond' in the atom context menu of the atom marked with white fireflies.

Two types of 'bonds' are not affected by DelBond, simply because they are not true covalent bonds:

• The graphical link between two atoms shown with the ShowTrace command, usually a Calpha trace or a DNA backbone trace. To remove such a graphical link, simply delete the covalent bond between the two residues, e.g. the peptide bond between atoms C and N. If the goal is to prevent the trace from bridging gaps in the chain, just delete all unusually long bonds together: DelBond all,all,LenMin=3

• Pseudo-bonds used to visualize interactions with metal ions. These cylinders are created with the ShowArrow command and can consequently be removed with HideArrow.

DelBond 105,109

Delete any bond between atoms 105 and 109.

DelBond Res 50,Res 50

Delete all bonds in residue 50.

DelBond Res 50,Res 51

Delete peptide bond between residues 50 and 51.

DelBond Fe,SG

Delete all bonds between Iron and SG atoms.

DelBond All,All,LenMin=3

Delete all bonds longer than 3 A.