Fig. 8.  Isoflurane increases intestinal sphingosine kinase (SK) 1, but not SK2, protein expression. (A ) Representative immunoblot images (of 4 experiments) of SK1, SK2, and β-actin from the small intestines of sham mice exposed to 4 h of pentobarbital or 1.2% isoflurane. (B ) Densitometric quantifications of band intensities relative to β-actin from immunoblot images. *P < 0.05 versus  the pentobarbital sham group. Data are presented as the mean ± SEM.