1P7D:
reference: A conformational switch controls the DNA cleavage activity of lambda integrase., Aihara H, Kwon HJ, Nunes-Duby SE, Landy A, Ellenberger T, Mol Cell 2003 Jul;12(1):187-98. PMID: 12887904

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