2001: Yeast estrogen screen assay--effective concentration inducing 20% of maximum response observed with [E.sub.2] Estradiol-17[beta] (reference chemical) 0.022000 E[C.sub.20] (ng/mL) Ethinylestradiol- 17[alpha] 0.059 E[C.sub.20] (ng/mL) Estrone 0.166 E[C.sub.20] (ng/mL) Estriol 0.627 E[C.sub.20] (ng/mL) Nonylphenol 246.7 E[C.sub.20] (ng/mL) Nonylphenol monoethoxylate 10,985.4 E[C.sub.20] (ng/mL) Nonylphenol monoethoxylate/ nonylphenol diethoxylate 9,627.6 E[C.sub.20] (ng/mL) Nonylphenol monoethoxycarbo-
xylate 0.0 E[C.sub.20] (ng/mL) Nonylphenol monoethoxycarbo- xylate/nonyl- phenol diethoxy- carboxylate 0.0 E[C.sub.20] (ng/mL) Bisphenol A 597.3 E[C.sub.20] (ng/mL) Diethylhexyl phthalate 0.0 E[C.sub.20] (ng/mL) Madigou et al.