1WKV:
reference: Three-dimensional Structure of a New Enzyme, O-Phosphoserine Sulfhydrylase, Involved in l-Cysteine Biosynthesis by a Hyperthermophilic Archaeon, Aeropyrum pernix K1, at 2.0A Resolution., Oda Y, Mino K, Ishikawa K, Ataka M, J Mol Biol 2005 Aug 12;351(2):334-44. PMID: 16005886

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