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Cover The meiotic maturation of Xenopus oocytes initiates specific changes in the translation of maternal mRNAs that coincide with alterations in their polyadenylation states. Shown are fully grown stage VI oocytes matured in vitro with progesterone. The white spot on the animal hemisphere of mature oocytes indicates the breakdown of the germinal vesicle. (For details, see Vamum and Wormington, p. 2278, and Fox and Wickens, p. 2287; photograph kindly provided by Michael Wormington.)
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