Figure 7. Effect of increasing concentrations of halothane on cyclic guanosine monophosphate content of endothelial cell-vascular smooth muscle co-cultures stimulated with control buffer (A), bradykinin 10 sup -6 M (B), adenosine triphosphate 10 sup -4 M (C), or the calcium ionophore A23187 10 sup -6 M (D). *P < 0.05.