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- Q4779801 subject Q7023558.
- Q4779801 abstract "The apical ectodermal ridge (AER) is a structure that forms from the ectodermal cells at the distal end of each limb bud and acts as a major signaling center to ensure proper development of a limb. After the limb bud induces AER formation, the AER and limb mesenchyme—including the zone of polarizing activity (ZPA)—continue to communicate with each other to direct further limb development.The position of the limb bud, and hence the AER, is specified by the expression boundaries of Hox genes in the embryonic trunk. At these positions, the induction of cell outgrowth is thought to be mediated by a positive feedback loop of fibroblast growth factors (FGFs) between the intermediate mesoderm, the lateral plate mesoderm and the surface ectoderm. FGF8 in the intermediate mesoderm signals to the lateral mesoderm, restricting the expression of FGF10 through intermediate Wnt signals. Then, FGF10 in the lateral plate mesoderm signals to the surface ectoderm to create the AER, which expresses FGF8.The AER is known to express FGF2, FGF4, FGF8, and FGF9, while the limb bud mesenchyme expresses FGF2 and FGF10. Embryo manipulation experiments have shown that some of these FGFs alone are sufficient for mimicking the AER.".
- Q4779801 thumbnail Limb_bud_diagram.jpg?width=300.
- Q4779801 wikiPageExternalLink skmus7a.htm.
- Q4779801 wikiPageWikiLink Q10816024.
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- Q4779801 wikiPageWikiLink Q6548937.
- Q4779801 wikiPageWikiLink Q7023558.
- Q4779801 wikiPageWikiLink Q7702833.
- Q4779801 latin "crista ectodermalis apicalis".
- Q4779801 name "Apical ectodermal ridge".
- Q4779801 type AnatomicalStructure.
- Q4779801 type Embryology.
- Q4779801 type Thing.
- Q4779801 type Q4936952.
- Q4779801 comment "The apical ectodermal ridge (AER) is a structure that forms from the ectodermal cells at the distal end of each limb bud and acts as a major signaling center to ensure proper development of a limb.".
- Q4779801 label "Apical ectodermal ridge".
- Q4779801 depiction Limb_bud_diagram.jpg.
- Q4779801 name "Apical ectodermal ridge".
- Q4779801 name "crista ectodermalis apicalis".