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Nucleotide sequence of the ribosomal RNA gene of Physarum polycephalum: intron 2 and its flanking regions of the 26S rRNA gene.
Nomiyama H
,
Kuhara S
,
Kukita T
,
Otsuka T
,
Sakaki Y
.
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The 26S ribosomal RNA gene of Physarum polycephalum is interrupted by two introns, and we have previously determined the sequence of one of them (intron 1) (Nomiyama et al. Proc.Natl.Acad.Sci.USA 78, 1376-1380, 1981). In this study we sequenced the second intron (intron 2) of about 0.5 kb length and its flanking regions, and found that one nucleotide at each junction is identical in intron 1 and intron 2, though the junction regions share no other sequence homology. Comparison of the flanking exon sequences to E. coli 23S rRNA sequences shows that conserved sequences are interspersed with tracts having little homology. In particular, the region encompassing the intron 2 interruption site is highly conserved. The E. coli ribosomal protein L1 binding region is also conserved.
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