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In another study, exposure to methoxychlor, a pesticide that binds to ESR1, increased the percentage of atretic follicles in Esr1-overexpressing mice compared with http://www.selleckchem.com/products/Maraviroc.html controls, suggesting heightened sensitivity to the pesticide (Tomic et al, 2006). A noteworthy finding of the present study was a significant (P http://www.selleck.cn/products/Paclitaxel(Taxol).html organs of Esr1-overexpressing mice are difficult to explain with the limited data available on this topic in the literature at this time. However, it is noteworthy that previous studies have shown that, among male reproductive organs, seminal vesicles are the most sensitive, and testes the least sensitive, to estrogen exposure. For example, following DES exposure to neonatal male rat pups at a dose of 0.1 mg/kg daily during postnatal days 1�C6, the weight reduction at adulthood was almost 70% in seminal vesicles vs 50% in bulbospongiosus/levator ani muscles vs 30% in testes, as compared with controls (Goyal et al, 2005b). Similarly, adult rats treated neonatally with estradiol benzoate had 80% reduction in the weight of seminal vesicles, in contrast to 20% http://www.selleckchem.com/products/pirfenidone.html in the testes (Putz et al, 2001). Reasons for differential response in estrogen-treated rats may be attributed, in part, to differences in susceptibility among these reproductive organs to estrogens, because all of them contain ERs (Hess et al, 1997b; Pelletier et al, 2000). The secretion of seminal vesicles forms a significant part of the ejaculate, and its fructose content provides nutrients to sperm in the female genital tract (Luke and Coffey, 1994), and the contraction of penile skeletal muscles aids in erection and ejaculation (Sachs, 1982). However, it is worth noting that the decline in weights of the seminal vesicles and bulbourethral/levator ani muscles was not sufficient to adversely affect the fertility of Esr1 overexpressors. The role of ERs, especially ESR1, in the male reproductive tract is well established. Both ESR1 and ESR2 have been localized in the male reproductive tract of most mammals studied previously (Danzo and Eller, 1979; West and Brenner, 1990; Iguchi et al, 1991; Goyal et al, 1997; Hess et al, 1997b), with the highest concentration of ESR1 in the efferent ductules, whose major function is to absorb almost 90% of the fluid leaving the testes (Ilio and Hess, 1994).