3ATR:
reference: Structure and mutation analysis of archaeal geranylgeranyl reductase., Sasaki D, Fujihashi M, Iwata Y, Murakami M, Yoshimura T, Hemmi H, Miki K, J Mol Biol. 2011 Jun 17;409(4):543-57. Epub 2011 Apr 16. PMID: 21515284

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