4B36:
reference: Crystal structure of human angiogenin with an engineered loop exhibits conformational flexibility at the functional regions of the molecule., Thiyagarajan N, Acharya KR, FEBS Open Bio. 2012 Dec 26;3:65-70. doi: 10.1016/j.fob.2012.12.003. Print 2013. PMID: 23772376

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