1. 1. Latt, S., Allen, J., Bloom, S., Carrano, A., Falk, F., Kram, D., Schneider, E., Schreck, R., Tice, R., Whitefield, B, and Wolff, S. (1981) : Mutat. Res., 87, 17-62.
2. 2. Evans, H. J. (1986) : In M. Sorsa and H. Norppa (eds.) , Monitoring of Occupational Genotoxicants. pp.3-24, ARL, Inc., New York.
3. 3. Shubber, E. K., Nada, S. M, and Al-Alaak, B. M. A. (1987) : J. Biol. Sci. Res., in press.
4. 4. Chaganti, R., Schonberg, S. and German, J. (1974) : Proc. Natl. Acad. Sci., 71, 4508-4512.
5. 5. Morimoto, K., Miura, K., Kaneko, T., Iijima, K., Sato, M, and Koizumi, A. (1984) : In R. R. Tice and A. Hollander (eds.) , Sister Chromatid Exchanges. pp.801-812. Plenum Press, New York, London.