Abstract
The large EcoRI fragment of mouse ribosomal genes containing parts of the non-transcribed spacer, the external transcribed spacer located at the 5' end of the precursor molecule and about two thirds of the 18S sequence has been cloned in bacteriophage lambda gtWES. A physical map of the DNA was constructed by cleavage with several restriction endonucleases and hybridization of the restriction fragments of the recombinant DNA with labelled 18S and 45S rRNA. The orientation of the inserted fragment as well as the length of the 18S sequence was determined by electron microscopy of R-loop containing molecules. The absence of hybridization of the cloned fragment to other fragments in the genome shows that the non-transcribed spacer does not have a significant length of sequences in common with other sequences in the genome.
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