“…,caffeine (1 mM) and heparine (10 mM) results in essential drop of NO2- production and infringement of cyclicity, the …, than on 15 s, and heparine--also on 5 s, and on 15 s. Preincubation of cells with methylene blue (10 mM), which inhibits guanilate … H2O2 formation and cyclicity losses.”