Before revision:  For this loop we found a salt bridge linkage ASP177-ARG163 (O-N)  Journal of Theoretical Biology 342 (7 February 2014) 70-82 (2014)  .
After revision:  For this loop we found a salt bridge linkage ASP177-ARG163 (O-N) ( Journal of Theoretical Biology 342 (7 February 2014) 70-82 (2014) .