title: Sequence heterogeneity in the internal transcribed spacers of two rat ribosomal DNA clones.
abstract: The sequence of one cloned rat rDNA segment is determined, encompassing the 3'-terminal part of 18 S rDNA (231 bp), ITS 1 (1072 bp), 5.8 S rDNA (156 bp), ITS 2 (771 bp) and the 5'-terminal part of 28 S rDNA (210 bp). Comparison with a distinct clone of the same rDNA segment reveals the identity of the rRNA gene sequences and considerable heterogeneity in both ITS 1 and ITS 2. The heterogeneities include mainly single base-pair changes (23 deletions or insertions and 14 substitutions) distributed all along the ITS sequences.
mesh_terms: D000818:Animals; D001482:Base Composition; D001483:Base Sequence; D003001:Cloning, Molecular; D004247:DNA / Q000235:genetics*; D004262:DNA Restriction Enzymes; D004275:DNA, Ribosomal; D005796:Genes; D008970:Molecular Weight; D012335:RNA, Ribosomal / Q000235:genetics; D051381:Rats; D014158:Transcription, Genetic
chemical_list: D004275:DNA, Ribosomal; D012335:RNA, Ribosomal; D004247:DNA; D004262:DNA Restriction Enzymes