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bud |
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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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