About the cover: A, BSO effects on oltipraz- or 2-(allylthio)pyrazine-inducible mEH and rGSTA2 mRNAs. B, the inhibition of oltipraz- or 2-(allylthio)pyrazine-inducible mEH and rGSTA2 mRNA expression by cysteine. See the article by Kim et al. in this issue on page 667.