Atomic contacts between close groups (residues: amino or nucleic acids)
are analysed for their biochemical bonding type.
You may want to look at standard BondLengths in the peptide unit.
URL for direct computation of results of this tool:
http://i.moltalk.org/rescontacts/4/PDB/1TAR/65/residue/258/3.4
and for a heterogenous group:
http://i.moltalk.org/rescontacts/4/PDB/1TAR/65/heterogen/258/3.4
parameters: