Finding intermodel H-bonds Finding intramodel H-bonds Constraints relaxed by 0.4 angstroms and 20 degrees Models used: #0 6ef3_s.cif H-bonds (donor, acceptor, hydrogen, D..A dist, D-H..A dist): SER 12.A OG ALA 13.A O no hydrogen 2.977 N/A HIS 37.A N HIS 34.A O no hydrogen 3.302 N/A