4UW2:
reference: Crystal Structure of the Csm1 Subunit of the Csm Complex and Its Single-Stranded DNA-Specific Nuclease Activity., Jung TY, An Y, Park KH, Lee MH, Oh BH, Woo E, Structure. 2015 Mar 3. pii: S0969-2126(15)00045-3. doi:, 10.1016/j.str.2015.01.021. PMID: 25773141

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