Select Contact Shells

See Figure 8.

Figure 8: Select Contact Shell Window

Select residues in:

Lets you choose whether to look through all sequences, or just the ones you have marked.

With a contact distance of:

defaults to 3.6 angstroms.

That are in the following contact shell(s) for the currently selected residues:

Choose from First, Second, or First and Second shells where first shells are defined as the the contacts within the contact distance of the selected sequences and the second shell is the shell within the contact distance of every residue in the first shell.