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(5) Fielder, R. J., Alleen, J. A., Boobis, A. R., Botham, P. A., Doe, J., Esdaile, D. J., Gatehouse, D. G., Hodson- Walker, G., Morton, D. B., Kirkland, D. J. and Richold, M (1992), Report of British Toxicology Society/ UK, Environmental Mutagen Society Working Group : Dose setting in In Vivo Mutagenicity Assays, Mutagenesis, 7, pp. 313-319.