6UNT:
reference: Development of a structure-analysis pipeline using multiple-solvent crystal structures of barrier-to-autointegration factor., Agarwal S, Smith M, De La Rosa I, Verba KA, Swartz P, Segura-Totten M, Mattos C, Acta Crystallogr D Struct Biol. 2020 Oct 1;76(Pt 10):1001-1014. doi:, 10.1107/S2059798320011341. Epub 2020 Sep 17. PMID: 33021502

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