1FU1:
reference: Crystal structure of the Xrcc4 DNA repair protein and implications for end joining., Junop MS, Modesti M, Guarne A, Ghirlando R, Gellert M, Yang W, EMBO J 2000 Nov 15;19(22):5962-70. PMID: 11080143

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