Fig. 3. In vivo  effects of halothane and thiopental anesthesia on lung surfactant-associated protein C:β-actin messenger RNA ratio (percentage of control value, mean ± SD) in rats mechanically ventilated during 4 and 8 hours (n = 6 for each duration). *P < 0.05 versus  control values. Control values are derived from nonanesthetized and nonventilated animals.