1A0P:
reference: Crystal structure of the site-specific recombinase, XerD., Subramanya HS, Arciszewska LK, Baker RA, Bird LE, Sherratt DJ, Wigley DB, EMBO J 1997 Sep 1;16(17):5178-87. PMID: 9311978

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