5TW0:
reference: The structure of the Pfp1 protease from the hyperthermophilic archaeon Thermococcus thioreducens in two crystal forms., Larson SB, McPherson A, Acta Crystallogr D Struct Biol. 2017 Sep 1;73(Pt 9):749-756. doi:, 10.1107/S2059798317010622. Epub 2017 Aug 15. PMID: 28876238

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