1A4Y:
reference: Molecular recognition of human angiogenin by placental ribonuclease inhibitor--an X-ray crystallographic study at 2.0 A resolution., Papageorgiou AC, Shapiro R, Acharya KR, EMBO J 1997 Sep 1;16(17):5162-77. PMID: 9311977

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).