1BNK:
reference: Crystal structure of a human alkylbase-DNA repair enzyme complexed to DNA: mechanisms for nucleotide flipping and base excision., Lau AY, Scharer OD, Samson L, Verdine GL, Ellenberger T, Cell 1998 Oct 16;95(2):249-58. PMID: 9790531

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