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Nucleic Acids Research, 1978, Vol. 5, No. 4 1335-1343
© 1978

Articles

Differently sized rDNA repeating units of Xenopus laevis are arranged as internally homogeneous clusters along the nucleolar organizer

Nikolaj Junakovic*, Antonio Poretti*, Francesco Amaldi* and Mario Buongiorno-Nardelli**

*Centro Acidi Nucleici del C.N.R., Istituto di Fisiologia Generale, Facoltà di Scienze, Università di Roma 00100 Roma, Italy **Istituto di Istologia ed Embriologia, Facoltà di Scienze, Università di Roma 00100 Roma, Italy

Received February 2, 1978. The organization of differently sized genes coding for rRNA in Xenopus 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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