2R9L:
reference: Structure of a NHEJ polymerase-mediated DNA synaptic complex., Brissett NC, Pitcher RS, Juarez R, Picher AJ, Green AJ, Dafforn TR, Fox GC, Blanco L, Doherty AJ, Science. 2007 Oct 19;318(5849):456-9. PMID: 17947582

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