Finding intermodel H-bonds Finding intramodel H-bonds Constraints relaxed by 0.4 angstroms and 20 degrees Models used: #0 4a1x_C.cif H-bonds (donor, acceptor, hydrogen, D..A dist, D-H..A dist): GLY 9.A N ASP 8.A OD1 no hydrogen 2.794 N/A HIS 16.A NE2 ASP 8.A OD1 no hydrogen 2.865 N/A