“On treatment with 50 &mgr;mol/L quercetin, 10 mmol/L N-acetyl-cysteine, both antioxidants, as well as the O2− scavenger Tiron (10 …;mol/L menadione, a reactive oxygen generator, and 10 nmol/L bradykinin showed similar effects on the level of cGMP as with CsA. CsA … nitrotyrosine ….”