3NOD:
reference: Structure of nitric oxide synthase oxygenase dimer with pterin and substrate., Crane BR, Arvai AS, Ghosh DK, Wu C, Getzoff ED, Stuehr DJ, Tainer JA, Science 1998 Mar 27;279(5359):2121-6. PMID: 9516116

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