3MK1:
reference: Refined structures of placental alkaline phosphatase show a consistent pattern of interactions at the peripheral site., Stec B, Cheltsov A, Millan JL, Acta Crystallogr Sect F Struct Biol Cryst Commun. 2010 Aug 1;66(Pt, 8):866-70. Epub 2010 Jul 27. PMID: 20693656

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