Shear stress (5, 10 and 20 dyme/cm2)-induced dilation (a and c), shear stress (10 dyne/cm2)-stimulated superoxide (b), and H2O2 (10-9-10-5M)-induced responses (d) in mesenteric arteries of female eNOS-KO (N/n=8/18) mice, before and after administration of AUDA and AUDA plus PPOH (a), or PEG-CAT and PEG-CAT plus PPOH (c) respectively. *Significant difference from the control and the presence of PPOH.