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limb bud |
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limb bud [′lim ‚bəd] (embryology) A mound-shaped lateral proliferation of the embryonic trunk; the anlage of a limb. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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The process takes 30 seconds, but a fluke burrowed in a tadpole's limb bud can cause an extra leg to sprout. In the developing limb bud of the arm, for example, HoxA genes at one end of the chromosome turn on first, marking cells intended for the upper arm. Most of the tissues differentiating in the newly formed limb bud arise from mesenchymal cells. |
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