4XPU:
reference: Crystal structure of E. coli endonuclease V, an essential enzyme for deamination repair., Zhang Z, Jia Q, Zhou C, Xie W, Sci Rep. 2015 Aug 5;5:12754. doi: 10.1038/srep12754. PMID: 26244280

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