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 --  -- and in a few seconds it's away, but it can be turned into these forms of nitric oxide -- nitrate, NO3; nitrite, NO2; nitrosothiols. And these are more stable, and your skin has got really large stores of NO.
Motivul, am aflat după doi-trei ani de muncă, era că în piele avem cantităţi imense, nu de oxid nitric, fiindcă acesta e un gaz care, odată eliberat, dispare în câteva secunde, ci de derivați ai oxidului nitric - nitrat, NO3; nitrit, NO2; tionitriți - care sunt mai stabile, iar pielea îi conţine în cantităţi foarte mari.