2FWR:
reference: Conserved XPB Core Structure and Motifs for DNA Unwinding: Implications for Pathway Selection of Transcription or Excision Repair., Fan L, Arvai AS, Cooper PK, Iwai S, Hanaoka F, Tainer JA, Mol Cell. 2006 Apr 7;22(1):27-37. PMID: 16600867

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