Finding intermodel H-bonds Finding intramodel H-bonds Constraints relaxed by 0.4 angstroms and 20 degrees Models used: #0 6xib_I.cif H-bonds (donor, acceptor, hydrogen, D..A dist, D-H..A dist): HIS 5.A ND1 ASP 4.A OD1 no hydrogen 2.847 N/A ALA 8.A N TYR 6.A O no hydrogen 3.099 N/A