Nucleic Acids Research, 1980, Vol. 8, No. 3 467-485
© 1980
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More ribosomal spacer sequences from Xenopus laevis
Institut für Molekularbiologie II der Universiät Zürich Hönggerberg, 8093 Zürich, Switzerland
Received December 14, 1979. The base sequence analysis of a Xenopis laevis ribosomal DNA repaat (7) has been extended to cover almost the entire non-transcribed and external transcribed spacer. A compilation of these sequences is presented. All the repetitive and non-repetitive sequence elements of the spacer are identified and their evolution discussed. Comparison of the X.laevis arxf S.cerevisiae (25,26) ribosomal DNAs shows abaut 80% sequence conservation in the 18S gene bat ro sequerce conservation, from the available data, in the external transcribed spacer. The sequence coding for the 3' terminus of the X. laevis 40S ribosomal precursor RNA is presented and its structural features analyzed.
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