Finding intermodel H-bonds Finding intramodel H-bonds Constraints relaxed by 0.4 angstroms and 20 degrees Models used: #0 3buw_A.cif H-bonds (donor, acceptor, hydrogen, D..A dist, D-H..A dist): SER 1.A OG PHE 2.A O no hydrogen 3.526 N/A PHE 2.A N SER 1.A OG no hydrogen 2.487 N/A