Cover Caption

Liver microsomes (5 µg) from individual male glucocorticoid receptor (+/+) and (/) mice or a (+/+) mouse treated with phenobarbital (PB) were analyzed by immunoblotting with monoclonal antibodies raised against rat CYP2B (anti-CYP2B 1, 2, and 3, monoclonal antibodies H8, BE28.2, and BE26.2, respectively) or polyclonal goat anti rat CYP2B(4). See the article by Schuetz et al. on page 268 of this issue.