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Figure 1   Limb bud rotation experiment. When a newly emerged limb bud (or regeneration blastema) is severed at its base and rotated 180 degrees on its stump, the result is a limb with three areas of outgrowth. In this case, the limb bud proceeded to form a radius and ulna with two new ulnas between them. At their tips were digits representing three partial wings. (After Javois and Iten, 1986.)
Figure 1
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