- Dose-dependent differences in the profile of mutations induced by an ultimate carcinogen from benzo[a]pyrene. Wei, S.J., Chang, R.L., Wong, C.Q., Bhachech, N., Cui, X.X., Hennig, E., Yagi, H., Sayer, J.M., Jerina, D.M., Preston, B.D. Proc. Natl. Acad. Sci. U.S.A. (1991)