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Table 2 Annotation of abundant introns based on presence of known small RNAs

From: Intronic RNAs constitute the major fraction of the non-coding RNA in mammalian cells

  Maximum intron/Exon density
  >10 fold 2-10 fold 1-2 fold 1 fold and above
Total introns* 96 707 4,950 5,753
UCSC snoRNAs 34 19 23 76
Ensemble snoRNAs 48 31 17 96
Non-mouse snoRNAs 1 0 0 1
Ensemble snRNAs 2 7 8 17
RNA repeats 3 14 52 69
Un-annotated 8 636 4,850 5,494
Un-annotated % 8.3% 90.0% 98.0% 95.5%
  1. *Introns overlapping an annotation were removed from the subsequent analysis. For example, introns overlapping UCSC snoRNAs were not to be used for comparison with Ensembl snoRNAs and so on.