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  • RNA Technical Resources from Ambion®
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  • Ribosomal RNA Sizes
  • /content/site/us/en/home/References/Ambion-Tech-Support/rna-isolation/general-articles/ribosomal-rna-sizes
General Articles
  • Does Fractionation of Blood Samples Affect mRNA Expression Levels?
  • Using LCM Samples to Get Intact RNA
  • Organisms Compatible with the MICROBExpress mRNA Isolation Kit
  • Tips for Handling RNA
  • Ribosomal RNA Sizes
  • RNA Yields from Tissues and Cells
  • Top Ten Ways to Improve Your RNA Isolation
  • The Basics: RNA Isolation
  • The Do's and Dont's of Total RNA Isolation
  • LiCl Precipitation for RNA Purification
  • Tips for Optimizing Bacterial Array Analysis
  • Extraction of Nucleic Acids from FFPE Samples
  • Tips for Working with Blood Samples
  • Gel Purification of Probes for Nuclease Protection Assays
  • Methods for Enzymatic Nonisotopic Labeling of RNA by in Vitro Transcription
  • Cell Disruption: Getting the RNA Out

Ribosomal RNA Sizes

Species rRNA Size (kb)
Human 18S 1.9
28S 5.0
Mouse 18S 1.9
28S 4.7
Drosophila 18S 2.0
28S 4.1*
Tobacco Leaf 16S 1.5
18S 1.9
23S 2.9
25S 3.7
Yeast 18S 2.0
26S 3.8
E. coli 16S 1.5
23S 2.9
Xenopus 28S 4.0
18S 1.8

*Drosophila 28S rRNA is processed into 2 fragments that migrate in a similar manner to the 18S rRNA.
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