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Catechins, a family of polyphenols found in tea, evoke various responses including cell death. We examined the cytotoxic effects of epicatechin gallate (ECG), a polyphenol extract from green tea, on the blastocyst stage of mouse embryos, subsequent embryonic attachment, and in vitro and in vivo outgrowth implantation after embryo transfer. Mouse blastocysts were incubated in medium with or without...