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In this commentary we focus on the function of FGFs during limb development and morphogenesis. Our goal is to understand, interpret and, when possible, reconcile the interesting findings and conflicting results that remain unexplained. For example, the cell death pattern observed after surgical removal of the AER versus genetic removal of the AER‐Fgfs is strikingly different and the field is at an...
The limb forms from a bud of mesoderm encased in a hull of ectoderm that grows out from the flank of the embryo. Coordinated signaling between the limb mesoderm and ectoderm is critical for normal limb outgrowth and patterning. The apical ectodermal ridge (AER), found at the distal tip, is a rich source of signaling molecules and has been proposed to specify distal structures and maintain the survival...
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