Nitric oxide circulates in mammalian plasma primarily as an s-nitroso adduct of serum albumin - Stamler, J S; Jaraki, O; Osborne, J; Simon, D I; Keaney, J; Vita, J; Singel, D J; Valeri, C R; Loscalzo, J (Proc Natl Acad Sci USA, 1992)