Demethylation of early embryogenesis occurs in the preimplantation period in two stages initially in the zygote, then the first few embryonic replication cycles of morula and blastula.
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:: : But then why specifically link to primitive streak, which refers to a stage of the blastula ? talk ) 20 : 59, 1 April 2015 ( UTC)
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During the blastula stage of development, a significant amount of activity occurs within the early embryo to establish cell polarity, E-cadherin in mammals and EP-cadherin in amphibians.
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There are some situations where many cells need to all replicate simultaneously ( for example, a growing embryo should have a symmetric cell distribution until it reaches the mid-blastula transition ).
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The map was a representation of an early-stage embryo ( such as a blastula ) that has particular regions highlighted which are known to give rise to specific tissues in the adult organism.
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During the blastula and gastrula stages, vegetal cells ( the presumptive endoderm ), release signals to marginal zone cells resulting in the induction and patterning of the mesoderm ( 1, 8 ).
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*Education Program : Boston College / Developmental Biology ( Spring 2013 ) : Histone methylation, Neural fold, Silencer ( DNA ), Three prime untranslated region, Blastula, RNA-binding protein
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Thus, if the first four cells are separated, each cell is capable of forming a complete small larva; and if a cell is removed from the blastula, the other cells will compensate.
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Importantly, unshelled embryos ( blastula, gastrula and trochophore stages ) were not found in snails > 16 mm and the numbers of shelled embryos themselves decreased in the largest snails, > 24 mm.
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The fertilized eggs develop into larvae by dividing until there are enough cells to form a hollow sphere ( blastula ) and then a depression forms at one end ( gastrulation ) and eventually become the digestive cavity.
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