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- W2347042854 abstract "ABSTRACT Longitudinal and transverse sections of the flask-shaped blastopore cells in the early gastrula of Triturus alpestris have been examined in the electron microscope. The cytoplasm may be divided into three main regions; a distal, superficial, granular zone; a vesicular and, more proximally, a pigment zone in the necks; and the main body of the cell with nucleus, yolk platelets and lipid droplets. A thin, continuous dense layer of extracellular material covers the cells at the free surface. Numerous microtubules oriented parallel to the main axes are found grouped in the necks. Other prominent organelles are vesicles, which from their structure have been divided into three categories, the alpha, beta and gamma vesicles. Longitudinal flanges extending along the necks are complexly interwound with those of adjacent cells and bind the cells firmly together in this region. Neither the extracellular layer, nor the superficial granular layer, is considered to exert a contractile force which would cause the cells to become elongated; rather the change in shape is brought about by active elongation within the internal cytoplasm, in which the microtubular system plays an important part. The material in the cell tips probably results from the passive accumulations of substances which originally covered a larger surface area. The alpha vesicles are common to all cells in the embryo, whereas the beta and gamma vesicles are characteristic of the blastopore cells. The function of these organelles is at present unknown, although there are some structural similarities between the beta vesicles and lysosomal particles described in other organisms." @default.
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- W2347042854 date "1966-06-01" @default.
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- W2347042854 title "Ultrastructure of the blastopore cells in the newt" @default.
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- W2347042854 doi "https://doi.org/10.1242/dev.15.3.317" @default.
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