And the reason for this, it turned out, after two or three years' work, was that in the skin we have huge stores not of nitric oxide, because nitric oxide is a gas, and it's released -- (Poof!) -- and in a few seconds it's away, but it can be turned into these forms of nitric oxide -- nitrate, NO3; nitrite, NO2; nitrosothiols.
A razón era --descubrímolo despois de dous ou tres anos de traballo-- que na pel temos uns enormes almacéns, non de óxido nítrico, que é un gas, e logo de liberado... puf! Nuns segundos desaparece, mais pode encontrarse noutras formas: nitrato (NO3), nitrito (NO2), tionitritos.