4LUG:
reference: Identification of an Arabidopsis inorganic pyrophosphatase capable of being imported into chloroplasts., Schulze S, Mant A, Kossmann J, Lloyd JR, FEBS Lett. 2004 May 7;565(1-3):101-5. PMID: 15135060

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