2NOS:
reference: The structure of nitric oxide synthase oxygenase domain and inhibitor complexes., Crane BR, Arvai AS, Gachhui R, Wu C, Ghosh DK, Getzoff ED, Stuehr DJ, Tainer JA, Science 1997 Oct 17;278(5337):425-31. PMID: 9334294

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