Finding intermodel H-bonds Finding intramodel H-bonds Constraints relaxed by 0.4 angstroms and 20 degrees Models used: #0 4day_C.cif H-bonds (donor, acceptor, hydrogen, D..A dist, D-H..A dist): SER 4.A OG PHE 3.A O no hydrogen 2.439 N/A THR 6.A OG1 SER 4.A O no hydrogen 2.918 N/A