Finding intermodel H-bonds Finding intramodel H-bonds Constraints relaxed by 0.4 angstroms and 20 degrees Models used: #0 8ati_a.cif H-bonds (donor, acceptor, hydrogen, D..A dist, D-H..A dist): SER 6.A N ASP 4.A OD1 no hydrogen 3.426 N/A SER 6.A OG ASP 4.A OD1 no hydrogen 2.708 N/A