5SV7:
reference: The ER stress sensor PERK luminal domain functions as a molecular chaperone to interact with misfolded proteins., Wang P, Li J, Sha B, Acta Crystallogr D Struct Biol. 2016 Dec 1;72(Pt 12):1290-1297. Epub 2016 Nov 29. PMID: 27917829

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