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The spark of life for the next generation occurs at fertilization when sperm and oocyte fuse. In animals, gametes are the only cells that transmit their genomes to the next generation. Oocytes contain in addition a large cytoplasm with factors that direct embryonic development. Reconstitution of mouse oocyte and embryonic development in culture provides experimental opportunities and facilitates an unprecedented understanding of molecular mechanisms. However, the application of in vitro gametogenesis to reproductive medicine or infertility treatment remains challenging. One significant concern is the quality of in vitro\u2010derived oocytes. Here, we review the current understanding and identify limitations in generating oocytes in vitro. 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