miRBase Expert Database

miRBase is a database of published miRNA sequences and annotations that provides a centralised system for assigning names to miRNA genes.


  • 9,919 distinct sequences from 27 organisms contributed to RNAcentral
  • the shortest sequence has 16 nucleotides, the longest 1,451
  • the average length is 41 nucleotides
  • database version: 21 (a subset of species)

Example entries

URS000075A685, URS00003B7674, URS000016FD1A

Browse all miRBase sequences



miRBase: integrating microRNA annotation and deep-sequencing data.
Kozomara A., Griffiths-Jones S. Nucleic Acids Res. 39(Database issue): D152-7 (2011 Jan)

Results Searching... 1 sequence {{result.entries.length}} out of {{result.hitCount | number}} sequences

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  • Make sure your spelling is correct

    Example: misspelled terms like Esherichia (missing "c") won't find any results

  • Use full species names

    Example: use Escherichia coli and not E. coli as your search terms

  • Make sure to include double quotes in field-specific search using the field:"field value" format

  • Read more about query syntax

  • {{rna.id}}

    • {{rna.fields.length[0] | number}} nucleotides
    • Obsolete

Displaying {{result.entries.length}} out of {{result.hitCount | number}} sequences