1QAA:
reference: Model of a LexA repressor dimer bound to recA operator., Chattopadhyaya R, Ghosh K, Namboodiri VM, J Biomol Struct Dyn 2000 Oct;18(2):181-97. PMID: 11089640

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