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blastoderm

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blastoderm
blastoderm Biol. (ˈblæstəʊdɜːm) [f. blasto- + Gr. δέρµα, δέρµατ- skin.] The germinal skin or membrane surrounding the yolk in the impregnated living ovum, and constituting the superficial layer of the embryo in its earliest condition. It divides into two and afterwards three layers of cells (the epi... Oxford English Dictionary
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Blastoderm
Gastrulation follows blastoderm formation, where the tips of the blastoderm begins the formation of the ectoderm, mesoderm, and endoderm. At the edge of the blastoderm is the site of active migration by most cells. wikipedia.org
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-blast
-blast [ad. Gr. βλαστ-ός sprout, shoot, germ] used as the second element in technical terms, esp. in Biology, in sense of ‘germ, embryo’ as in epiblast, mesoblast, and hypoblast; cf. blastoderm. Oxford English Dictionary
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Epiblast
Eduard Joseph d'Alton (1772-1840), Pander observed thousands of chicken eggs under a microscope, and ultimately discovered and described the chicken blastoderm Other early embryologists that studied the epiblast and blastoderm include Karl Ernst von Baer (1792-1876) and Wilhelm His (1831-1904). wikipedia.org
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Hunchback (gene)
It is activated by the maternal Bicoid morphogen gradient and determines the anterior-posterior axis within the syncytial blastoderm. wikipedia.org
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mesoblast
mesoblast Biol. (ˈmɛsəʊblæst) [f. meso- + -blast.] The middle layer of the blastoderm, between the epiblast and the hypoblast. Also attrib. Hence ˈmesoblasted a., having a mesoblast.1857 Agassiz Contrib. Nat. Hist. U.S.A. II. 467 The mesoblast of the yolk cell. Ibid. II. 617 Some of the mesoblasted ... Oxford English Dictionary
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Triploblasty
The term triploblast may refer to any egg cell in which the blastoderm splits into three layers. wikipedia.org
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delamination
delamination Biol. (dɪlæmɪˈneɪʃən) [n. of action from prec.] The process of splitting into separate layers: spec. applied to the formation of the layers of the blastoderm (q.v.).1877 Huxley Anat. Inv. Anim. iii. 115 note, The formation of the gastrula by delamination, or splitting of the walls of an... Oxford English Dictionary
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Hypoblast
Area opaca is the blastoderm's peripheral part where the cells remain unseparated from the yolk. It is a white area that transmits light. Simultaneously, the secondary hypoblast (endoblast) cells continue to migrate anteriorly from the blastoderm's posterior marginal zone. wikipedia.org
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Krüppel
Krüppel expression pathway Krüppel is expressed in the center of the embryo during the cellular blastoderm stage of development. In this way the initial gradients of morphogens can lead to the establishment of a specific region within the blastoderm. wikipedia.org
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Trilaminar embryonic disc
A trilaminar embryonic disc (or trilaminary blastoderm, or trilaminar germ disk) is an early stage in the development of triploblastic organisms, which wikipedia.org
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Drosophila embryogenesis
These patterns of expression are established within the syncytial blastoderm. After these initial patterning events, cell membranes form around the nuclei of the syncytial blastoderm converting it to a cellular blastoderm. wikipedia.org
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Epiboly
Interior cells of the blastoderm move towards the outer cells, thus "intercalating" with each other. Studies on fundulus demonstrated that the YSL is capable of undergoing epiboly even when the blastoderm has been removed, however, the blastoderm cannot wikipedia.org
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Coenocyte
The word syncytium in animal embryology is used to refer to the coenocytic blastoderm of invertebrates. At first, the nuclei of the early embryo rapidly and synchronously divide in the "syncytial" blastoderm and then migrate through the cytoplasm and position wikipedia.org
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Extraembryonic membrane
The extraembryonic membranes in insects include a serous membrane originating from blastoderm cells, an amnion or amniotic cavity whose expression is controlled wikipedia.org
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