Before revision:  Some scientists said on the 2FJ3.pdb NMR file of the rabbit prion protein, the distance of ASP177-ARG163 (O-N) gives the salt bridge of about 10 angstroms which is nearly null in terms of energy thus think our result is wrong.
After revision:  Some scientists said on the 2FJ3.pdb NMR file of the rabbit prion protein, the distance of ASP177-ARG163 (O-N) gives the salt bridge of about 10 \AA which is nearly null in terms of energy thus think our result is wrong.