1AE9:
reference: Flexibility in DNA recombination: structure of the lambda integrase catalytic core., Kwon HJ, Tirumalai R, Landy A, Ellenberger T, Science 1997 Apr 4;276(5309):126-31. PMID: 9082984

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