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Preservation of Xenopus laevis rDNA-containing plasmid, pXlr101A, injected into the fertilized egg of Xenopus laevis



Preservation of Xenopus laevis rDNA-containing plasmid, pXlr101A, injected into the fertilized egg of Xenopus laevis



Cell Structure and Function 11(2): 109-114



A circular rDNA-containing recombinant plasmid, pXlr101A, and its vector pBR322 were microinjected into the cytoplasm of fertilized Xenopus laevis eggs. The DNAs extracted from injected embryos at various stages of development were analyzed by hybridization with 32P-labeled pBR322 as the probe. Neither pXlr101A nor pBR322 were replicated, but they were maintained until the tailbud stage, disappearing during the muscular response stage. When pXlr101A-injected embryos were raised until the 2-week-old tadpole stage, sequences homologous to pBR322 were detectable in two Eco RI fragments of the pXlr101A-injected tadpole DNA. The sizes of the Eco RI fragments suggested that the plasmid sequences were preserved most probably in the chromosome-integrated form.

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Accession: 041050640

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PMID: 3731283


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