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Plant culture. Test tubes containing plant seedlings with a pipette being inserted into one of them. The gel in the test tube is a soil- substitute containing the nutrients needed by the growing plant. Plants can be grown in this way from a tiny fragment or single cell of a "parent" plant in a process called micropropagation. Carefully controlled conditions cause the fragment to develop into an embryo which then produces roots and shoots like a normal seedling. The technique allows mass agricultural production of genetically identical plants and is an effective way of propagating any genes introduced into the parent plant.
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