3PPZ:
reference: Protein kinase domain of CTR1 from Arabidopsis thaliana promotes ethylene receptor cross talk., Mayerhofer H, Panneerselvam S, Mueller-Dieckmann J, J Mol Biol. 2012 Jan 27;415(4):768-79. Epub 2011 Dec 7. PMID: 22155294

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