Fig. 2. Microvessel dilation caused by halothane alone and in the presence of 7-NINA and L-NAME. Dilation was calculated as a percentage of the amount of preconstriction (see text). Halothane partial pressures (%) were calculated from measured bath concentrations (mM). Error bars represent SEM. *P < 0.05 versus  halothane group. †P < 0.05 versus  7-NINA + halothane group. There was similar attenuation of halothane-induced dilation by 7-NINA and L-NAME at 0.6, 1.6, and 2.6% halothane.