1NEQ:
reference: The solution structure of the Mu Ner protein reveals a helix-turn-helix DNA recognition motif., Strzelecka TE, Clore GM, Gronenborn AM, Structure 1995 Oct 15;3(10):1087-95. PMID: 8590003

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