1. BOUTWELL, R. K. (1978). Biochemical mechanism of tumor promotion. In: Mechanisms of Tumor Promotion and Cocarcinogenesis. (T.J. Slaga, A. Sivak, and R.K. Boutwell, eds.) Vol. II, pp. 49?58. Raven Press, New York.
2. CAMPBELL, R.C. (1974). Statistics for Biologists. Cambridge University Press, London.
3. COHEN, S.M., ARAI, M., JACOBS, J.B. and FRIEDELL, G.H. (1979). Promoting effects of saccharin and D,L-tryptophan in urinary bladder carcinogenesis. Cancer Res. 39:1207?1217.
4. DAVIDSON, J.S., BAUMGARTEN, I. and HARLEY, H. (1985). Use of a new citrulline incorporation assay to investigate inhibition of intercellular communication by 1,1,1trichloro-2,2-bis(p-chlorophenyl)ethane in human fibroblasts. Cancer Res. 45:515?519.
5. ENOMOTO, T. and YAMASAKI, H. (1985). Phorbol ester-mediated inhibition of intercellular communication in Balb/c 3T3 cells: Relationship to enhancement of cell transformation. Cancer Res. 45:2681?2688.