2L4A:
reference: The Design Involved in PapI and Lrp Regulation of the pap Operon., Kawamura T, Vartanian AS, Zhou H, Dahlquist FW, J Mol Biol. 2011 Feb 19. PMID: 21338611

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