Finding intermodel H-bonds Finding intramodel H-bonds Constraints relaxed by 0.4 angstroms and 20 degrees Models used: #0 1tet_P.cif H-bonds (donor, acceptor, hydrogen, D..A dist, D-H..A dist): SER 4.A OG HIS 6.A ND1 no hydrogen 3.425 N/A HIS 6.A N SER 4.A OG no hydrogen 3.065 N/A HIS 6.A ND1 SER 4.A O no hydrogen 2.957 N/A SER 9.A N ASP 8.A OD1 no hydrogen 2.977 N/A