1BIU:
reference: Three new structures of the core domain of HIV-1 integrase: an active site that binds magnesium., Goldgur Y, Dyda F, Hickman AB, Jenkins TM, Craigie R, Davies DR, Proc Natl Acad Sci U S A 1998 Aug 4;95(16):9150-4. PMID: 9689049

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