6EYC:
reference: ISOLDE: a physically realistic environment for model building into low-resolution electron-density maps., Croll TI, Acta Crystallogr D Struct Biol. 2018 Jun 1;74(Pt 6):519-530. doi:, 10.1107/S2059798318002425. Epub 2018 Apr 11. PMID: 29872003

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