3GNB:
reference: Structure of the RAG1 nonamer binding domain with DNA reveals a dimer that mediates DNA synapsis., Yin FF, Bailey S, Innis CA, Ciubotaru M, Kamtekar S, Steitz TA, Schatz DG, Nat Struct Mol Biol. 2009 May;16(5):499-508. Epub 2009 Apr 26. PMID: 19396172

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