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XB-ART-32026
Nucleic Acids Res 1978 Apr 01;54:1335-43.
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Differently sized rDNA repeating units of Xenopus laevis are arranged as internally homogeneous clusters along the nucleolar organizer.

Junakovic N , Poretti A , Amaldi F , Buongiorno-Nardelli M .


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The organization of differently sized genes coding for rRNA in Xenophus laevis has been investigated by partial EcoRI or HindIII digestion. The electrophoretic patterns obtained revealed that most adjacent repeating units are equally sized. This conclusion is in agreement with a previous suggestion that the nucleolar organizer is made up of internally homogeneous blocks of rRNA genes.

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References [+] :
Brown, The structure and evolution of ribosomal and 5S DNAs in Xenopus laevis and Xenopus mulleri. 1974, Pubmed, Xenbase