Phosphorylations of endothelial nitric oxide synthase (eNOS) and neuronal NOS (nNOS) are higher in female compared with male cerebral arteries. Representative Western blots and summary data: 140-kDa phosphorylated eNOS (peNOS) (A) and total eNOS (B), phosphorylated eNOS/total eNOS ratio (C), 155-kDa phosphorylated nNOS (pnNOS) (D), total nNOS (E), and phosphorylated nNOS/total nNOS ratio (F). Data are expressed as means ± SE. *P < 0.05 (female vs. male, n = 10–14 samples in each group).