6BTC:
reference: Crystal Structure of an Unusual Single-Stranded DNA-Binding Protein Encoded by Staphylococcal Cassette Chromosome Elements., Mir-Sanchis I, Pigli YZ, Rice PA, Structure. 2018 Jun 8. pii: S0969-2126(18)30180-1. doi:, 10.1016/j.str.2018.05.016. PMID: 30017563

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