6MDH:
reference: Structure of interferon-stimulated gene product 15 (ISG15) from the bat species Myotis davidii and the impact of interdomain ISG15 interactions on viral protein engagement., Langley C, Goodwin O, Dzimianski JV, Daczkowski CM, Pegan SD, Acta Crystallogr D Struct Biol. 2019 Jan 1;75(Pt 1):21-31. doi:, 10.1107/S2059798318015322. Epub 2019 Jan 4. PMID: 30644842

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