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I dont think this article is upto standards.... How could someone discuss NOS without even referring to "vasodilation"

That's for sure!

Simple lead-in is needed. There's a hodgepodge of detail in the introductory sentences. -- CopperKettle 18:08, 1 May 2009 (UTC) reply

The four types of NOS have completely different functions. Vasodilation is a function only of eNOS. This article is evolving nicely. -- Zymatik ( talk) 19:30, 1 March 2018 (UTC)-- Zymatik ( talk) 19:30, 1 March 2018 (UTC) reply

Should also be noted that many bacteria have related nitric oxide synthase genes. The NO produced helps them to withstand various chemical attacks. Ivan Gusarov, et al. Science 325, 1380 (2009);DOI: 10.1126/science.1175439