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In avian gastrulation, Koller's sickle is a local thickening of cells at the posterior edge of the upper layer of the area pellucida called the epiblast. Koller's sickle is crucial for avian development, due to its critical role in inducing the differentiation of various avian body parts. Koller's sickle induces primitive streak and Hensen's node, which are major components of avian gastrulation. Avian gastrulation is a process by which developing cells in an avian embryo move relative to one another in order to form the three germ layers (endoderm, mesoderm, and ectoderm).

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  • In avian gastrulation, Koller's sickle is a local thickening of cells at the posterior edge of the upper layer of the area pellucida called the epiblast. Koller's sickle is crucial for avian development, due to its critical role in inducing the differentiation of various avian body parts. Koller's sickle induces primitive streak and Hensen's node, which are major components of avian gastrulation. Avian gastrulation is a process by which developing cells in an avian embryo move relative to one another in order to form the three germ layers (endoderm, mesoderm, and ectoderm). (en)
  • A foice de Koller (ou Koller's sickle) nada mais é do que um agrupamento de células que se forma antes da gastrulação, abaixo da zona marginal superior do epiblasto. Este agrupamento de células recebe o nome de foice por ter a forma de uma lua na fase crescente. A foice de Koller é fundamental durante a gastrulação, pois secreta FGF (fibroblast growth factor) que juntamente com Nodal (proteína secretora codificada pelo gene NODAL) induz a formação da linha primitiva. (pt)
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  • In avian gastrulation, Koller's sickle is a local thickening of cells at the posterior edge of the upper layer of the area pellucida called the epiblast. Koller's sickle is crucial for avian development, due to its critical role in inducing the differentiation of various avian body parts. Koller's sickle induces primitive streak and Hensen's node, which are major components of avian gastrulation. Avian gastrulation is a process by which developing cells in an avian embryo move relative to one another in order to form the three germ layers (endoderm, mesoderm, and ectoderm). (en)
  • A foice de Koller (ou Koller's sickle) nada mais é do que um agrupamento de células que se forma antes da gastrulação, abaixo da zona marginal superior do epiblasto. Este agrupamento de células recebe o nome de foice por ter a forma de uma lua na fase crescente. A foice de Koller é fundamental durante a gastrulação, pois secreta FGF (fibroblast growth factor) que juntamente com Nodal (proteína secretora codificada pelo gene NODAL) induz a formação da linha primitiva. (pt)
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  • Koller's sickle (en)
  • Foice de Koller (pt)
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