Figure 7. The effects of halothane (A), enflurane (B), and isoflurane (C) on basal and rat atrial natriuretic peptide sub (1-28)) (ANP sub (1-28) -stimulated rat brain particulate guanylyl cyclase activity (n = 12). *P < 0.05 compared with basal guanylyl cyclase activity. cGMP = cyclic guanosine monophosphate.