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. This opinion is clearly wrong simply due to the 3O79.pdb X-ray file of the rabbit prion protein has this salt bridge.
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 angstroms which is nearly null in terms of energy and such a salt bridge is not observed in their work. But, from the 3O79.pdb X-ray file of the rabbit prion protein has this salt bridge.