| 1QNT | A:6-90 | X-RAY STRUCTURE OF HUMAN O6ALKYLGUANINE-DNA ALKYLTRANSFERASE | 
  | 1T38 | A:6-90 | HUMAN O6-ALKYLGUANINE-DNA ALKYLTRANSFERASE BOUND TO DNA CONTAINING O6-METHYLGUANINE | 
  | 1YFH | C:6-90; C:6-90; C:6-90 | WT HUMAN O6-ALKYLGUANINE-DNA ALKYLTRANSFERASE BOUND TO DNA CONTAINING AN ALKYLATED CYTOSINE |