Finding intermodel H-bonds Finding intramodel H-bonds Constraints relaxed by 0.4 angstroms and 20 degrees Models used: #0 1yf4_B.cif H-bonds (donor, acceptor, hydrogen, D..A dist, D-H..A dist): CYS 1.A SG GLN 4.A O no hydrogen 3.180 N/A CYS 6.A SG GLN 4.A O no hydrogen 3.580 N/A