4A15:
reference: Functional and structural studies of the nucleotide excision repair helicase XPD suggest a polarity for DNA translocation., Kuper J, Wolski SC, Michels G, Kisker C, EMBO J. 2011 Nov 11;31(2):494-502. doi: 10.1038/emboj.2011.374. PMID: 22081108

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