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For the fungal genus, see Truffle. A tuber is a part of a rhizome thickened for use as a storage organ. It is usually, though not always, subterranean, such as a potato. This modified stem forms at the end of a lateral branch. Auxiliary buds are located at the nodes. When the buds develop, adventitious roots and rhizomes form below them. This should not be confused with a tuberous root such as a sweet potato or Dahlia, which is a similarly swollen root. A tuber can also be a small benign tumour, such as in Tuberous Sclerosis
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