1LMZ:
reference: 3-Methyladenine DNA glycosylase I is an unexpected helix-hairpin-helix superfamily member., Drohat AC, Kwon K, Krosky DJ, Stivers JT, Nat Struct Biol 2002 Sep;9(9):659-64. PMID: 12161745

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