1I09:
reference: Structure of GSK3beta reveals a primed phosphorylation mechanism., ter Haar E, Coll JT, Austen DA, Hsiao HM, Swenson L, Jain J, Nat Struct Biol 2001 Jul;8(7):593-6. PMID: 11427888

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