“…The teratogenicity of estrogens on the developing uterus is well established both in laboratory animals and humans (Viscomi et al, 1980;Haney et al, 1979;Cunha et al, 1987;Kaufman et al, 1977Kaufman et al, , 1980Forsberg, 1988;Mori and Iguchi, 1988). Immediate effects of estrogens on the developing uterus include qualitative and quantitative changes in protein synthesis (Newbold et al, 1981(Newbold et al, , 1984 and stimulation of epithelial proliferation (Forsberg, 1970;Eide, 1975a,b;Bigsby and Cunha, 1986).…”