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It is important to understand how to make references to adjacent residues when constructing a topology file. The following table lists the possible prefixes which may used. Note that the actual atoms referenced are not determined until the generation of segments, see Generate Command.

The next residue in the sequence.
The previous residue in the sequence.
Two residues forward in the sequence.
Two residues backward in the sequence.
n residues forward in the sequence. Note that `+' sign is mandatory.
n residue backward in the sequence.

No reference will be made beyond the end of a segment. In the case of cyclic peptide, CONGEN will wrap around the sequence in the appropriate direction.