Titlebook: Gastrulation; Movements, Patterns Ray Keller,Wallis H. Clark,Frederick Griffin Book 1991 Springer Science+Business Media New York 1991 Gas

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Magnetische Eigenschaften von Eisen Imotility, net directionality of cell movements, etc. The morphogenetic event soon becomes bewilderingly complicated. And if one then projects to the complex anatomy that eventually carries the organism through its somatic lifetime, the complexity seems even more impressive. Yet at the same time we a

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Culture of Embryonic Cells for Analysis of Amphibian and Mammalian Early Embryogenesis,nalysis of cell behavior. Our analysis revealed an important role for the ECM fibril network containing fibronectin as a substratum which guided mesodermal cell migration by contact guidance..A similar strategy was used for the analysis of mammalian gastrulation. Mesodermal cells isolated from the p

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The Arrangement of Early Inductive Signals in Relation to Gastrulation; Results from Frog and Chick related to deep . superficial position within the blastula wall as well as to cells’ distances from initial sources of induction, ., to ‘height’ in the marginal zone towards the animal pole. As described by Keller and his associates (op. cit. and Keller 1986; Wilson . 1989) the role of this sector

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Analysis of Convergent Cell Movements in The Germ Ring of ,ovement and amount of motile quiescence are the same near and far, the greater net trajectory of the nearer cells must be due to less meandering. This suggests that there are exogenous factors that promote directionality toward the ES and that they operate more efficiently close to it. Cells in the

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Mesoderm Cell Migration in the , Gastrula, which is one prerequisite for highly persistent migration. The second requirement is that the mesoderm aggregate moves on a proper substrate. The extracellular matrix of the inner BCR surface can be deposited on a plastic substrate. This conditioned substrate contains directional cues which guide t

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The Expression of Fibronectins and Integrins During Mesodermal Induction and Gastrulation in ,,ted from stage 8 embryos and exposed to the XTC mesoderm inducing factor (XTC-MIF; a . homologue of activin A). Animal pole ectoderm treated with XTC-MIF, like stage 10 dorsal marginal zone, will adhere and spread on FN coated surfaces. Uninduced animal pole ectoderm adheres poorly and does not spre

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Functional

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Ultraviolet-Sensitive Determinants of Gastrulation and Axis Development in the Ascidian Embryo,First, p30 labelling peaks during gastrulation, when the embryonic axis is being established. Second, p30 labelling and axis formation are abolished by the same threshold UV dose. Third, the UV sensitivity period for abolishing p30 labelling and axis formation are both restricted to ooplasmic segreg

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