... estrogenreceptor and is found on the standard estrogenic chemical, 17-beta-estradiol (see Combes, 2000).Other examples of molecules possessing this biophore include 4- hydroxytamoxifen, 2-chloro- 4- hydroxybiphenyl, ... structure-activity relationships as an alternative to testing in animals for carcino-genicity, mutagenicity, dermal and eye irritation, and acute oral toxicity, Toxicol. Ind. Health, 4, 47 9 49 8, ... biophore include 4- hydroxytamoxifen, 2-chloro- 4- hydroxybiphenyl, 3 , 4- dihydroxyfluorene, and 2, 2-( bis -4 - hydroxyphenyl–1,1,1-trichloroethane).b. Tubulin InhibitionBiophores of some tubulin inhibitors...