title: A spectrophotometric study of the secondary structure of precursor ribosomal ribonucleic acid from Krebs ascites-tumour cells.
abstract: The spectrophotometric analysis of 45S precursor rRNA shows that it contains more G and C residues than does mature 28S or 18S rRNA. The helical content and the length of double-helical segments in 45S and 28S rRNA are similar.
mesh_terms: D000818:Animals; D002287:Carcinoma, Krebs 2 / Q000378:metabolism*; D002501:Centrifugation, Zonal; D051379:Mice; D008970:Molecular Weight; D009690:Nucleic Acid Conformation; D009691:Nucleic Acid Denaturation; D012335:RNA, Ribosomal / Q000032:analysis*; D013053:Spectrophotometry
chemical_list: D012335:RNA, Ribosomal