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- W2407007788 abstract "The larvae of non-vertebrate chordate ascidians consist of countable numbers of cells. With this feature, ascidians provide us with excellent models for studying cellular events in the construction of the chordate body. This review discusses the recent observations of morphogenetic movements and cell cycles and divisions along with tissue specifications during ascidian embryogenesis. Unequal cleavages take place at the posterior blastomeres during the early cleavage stages of ascidians, and the structure named the centrosome-attracting body restricts the position of the nuclei near the posterior pole to achieve the unequal cleavages. The most-posterior cells differentiate into the primordial germ cells. The gastrulation of ascidians starts as early as the 110-cell stage. During gastrulation, the endodermal cells show two-step changes in cell shape that are crucial for gastrulation. The ascidian notochord is composed of only 40 cells. The 40 cells align to form a single row by an event named the convergent extension, and then the notochord cells undergo vacuolation to transform the notochord into a single hollowed tube. The strictly restricted number of notochord cells is achieved by the regulated number of cell divisions coupled with the differentiation of the cells conducted by a key transcription factor, Brachyury. The dorsally located neural tube is a characteristic of chordates. During the closure of the ascidian neural tube, the epidermis surrounding the neural plate moves toward the midline to close the neural fold. This morphogenetic movement is allowed by an elongation of interphase in the epidermal cell cycles." @default.
- W2407007788 created "2016-06-24" @default.
- W2407007788 creator A5031719470 @default.
- W2407007788 creator A5082885280 @default.
- W2407007788 date "2013-06-01" @default.
- W2407007788 modified "2023-10-16" @default.
- W2407007788 title "Ascidians as Excellent Models for Studying Cellular Events in the Chordate Body Plan" @default.
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- W2407007788 doi "https://doi.org/10.1086/bblv224n3p227" @default.
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- W2407007788 hasPublicationYear "2013" @default.
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