title: Nucleotide sequence and presumed secondary structure of the internal transcribed spacers of rDNA of the pea aphid, Acyrthosiphon pisum.
abstract: 1. Internal transcribed spacer (ITS) 1 and ITS 2 of rDNA of the pea aphid, Acyrthosiphon pisum consisted of 229 and 280 nucleotides, whose G+C contents were 70 and 74%, respectively. 2. Secondary structure models constructed for the ITS 1 and ITS 2 suggested that certain structural motifs have been conserved in these regions despite extensive divergence in nucleotide sequence due to species.
authors.affiliation: Zoological Institute, Faculty of Science, University of Tokyo, Japan.
authors.forename: O Y
authors.initials: OY
authors.lastname: Kwon
authors.forename: H
authors.initials: H
authors.lastname: Ishikawa
mesh_terms: D000818:Animals; D001042:Aphids / Q000235:genetics*; D001482:Base Composition; D001483:Base Sequence; D004275:DNA, Ribosomal / Q000737:chemistry / Q000235:genetics*; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D014158:Transcription, Genetic
chemical_list: D004275:DNA, Ribosomal