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Charité, J.a and De Graaff, W.a and Shen, S.a b and Deschamps, J.a
1994
Ectopic expression of Hoxb-8 causes duplication of the ZPA in the forelimb and homeotic transformation of axial structures
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Transgenic embryos were generated carrying a Hoxb-8 transgene under control of the mouse RARβ2 promoter, which extends the normal expression domain to more anterior regions of the embryo. These embryos showed mirror- image duplications in the forelimb, analogous to the duplications observed in chick in response to transplantation of a ZPA to the anterior margin of the limb bud. Examination of Sonic hedgehog, Fgf-4, and Hoxd-11 gene expression confirmed that a second ZPA had been generated at the anterior side of the limb bud. Besides other alterations, posterior homeotic transformations of axial structures were observed, involving the first spinal (Froriep's) ganglion and several cervical vertebrae.
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