2CI6:
reference: Structure of the mammalian NOS regulator dimethylarginine dimethylaminohydrolase: A basis for the design of specific inhibitors., Frey D, Braun O, Briand C, Vasak M, Grutter MG, Structure. 2006 May;14(5):901-11. PMID: 16698551

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