Organization of ribosomal RNA gene repeats of the mouse.
The organization of the ribosomal RNA (rRNA) genes of the mouse was determined by Southern blot hybridization using cloned rDNA fragments as probes, which could encompass the entire spacer region between two rRNA gene regions. The rRNA genes are organized into tandem repeats of nearly uniform length of about 44 kb. The heterogeneity detected in the nontranscribed spacer appears to be caused by its sequence rather than its length difference. At least three kinds of repetitive sequences are present in the non-transcribed spacer region; two of them are located 13 kb upstream from the 5'-end of 18S RNA gene and the other located 1 to 4 kb downstream from the 3'-end of 28S RNA gene.
20 references, click to expand
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