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- W2739555611 abstract "This chapter summarizes experiments carried out over the last few years on the nature and control of events that occur during maturation and the time period immediately following it. It is concerned primarily with an analysis of the hormonal induction of maturation, the nature and possible consequences of macromolecular synthesis during and immediately after the period of maturation, and the role of the germinal vesicle and its products in the events of maturation and later development. Both the enucleation and actinomycin D studies show that the oocyte cytoplasm, prior to progesterone exposure, already has the capacity to perform many of the events of maturation in the absence of additional nuclear-directed synthesis. With the additional contribution of material stored in the germinal vesicle, the full-grown oocyte has the capacity to develop through the blastula stage in the absence of nuclear control. Cell differentiation is initiated as a result of interactions between “identical” cleavage nuclei and a heterogeneous cytoplasm. The fertilized egg contains an array of cytoplasmic materials that somehow determine the later pattern of organogenesis. These materials most certainly were synthesized during oogenesis and stored either in the rytoplasni or in the large germinal vesicle. Both the studies with amphibians and those on sea urchins indicate the presence of a heterogeneous population of stable templates in the egg cytoplasm. Some of these templates undoubtedly function in the immediate regulation of maturation and cleavage, but others could play a role in the regulation of gene function." @default.
- W2739555611 created "2017-08-08" @default.
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- W2739555611 date "1970-01-01" @default.
- W2739555611 modified "2023-09-26" @default.
- W2739555611 title "Chapter 1 Regulatory Processes in the Maturation and Early Cleavage of Amphibian Eggs" @default.
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- W2739555611 doi "https://doi.org/10.1016/s0070-2153(08)60051-4" @default.
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