Linked from
The 7 pages that link to Nitric oxide synthase, each with the reason it gives.
HemeRelated: A heme group helps bind oxygen and nitric oxide during catalysis.
NADPHRelated: NADPH-derived electrons help drive nitric oxide production.
ArginineRelated: This enzyme consumes arginine to make nitric oxide, a signaling molecule.
CitrullineRelated: Citrulline is released as a coproduct when these enzymes make nitric oxide.