4V2W:
reference: Studies on the catalytic domains of multiple JmjC oxygenases using peptide substrates., Williams ST, Walport LJ, Hopkinson RJ, Madden SK, Chowdhury R, Schofield CJ, Kawamura A, Epigenetics. 2014 Dec 2;9(12):1596-603. doi: 10.4161/15592294.2014.983381. PMID: 25625844

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