Search miRBase

By miRNA identifier or keyword

Enter a miRNA accession, name or keyword:


By genomic location

Select organism, chromosome and start and end coordinates. Leave the start/end boxes blank to retrieve all miRNAs on the selected chromosome.

Chr: Start: End:

For clusters

Select organism and the desired inter-miRNA distance.

Inter-miRNA distance:

By tissue expression

Select organism and tissue.

By sequence

Single sequence searches:
Paste a sequence here to search for similarity with miRBase miRNA sequences (max size 1000 nts). You can choose to search against hairpin precursor sequences or mature miRNAs. This search may take a few minutes. Please note: this facility is designed to search for homologs of microRNA sequences, not to predict their target sites. For target site prediction, please use the available bespoke tools.

Or: Select the sequence file you wish to use

Search sequences:
Search method:
Choose BLASTN to search for a miRNA homolog in a longer sequence. SSEARCH is useful for finding a short sequence within the library of miRNAs (for instance, find a short motif in a miRNA or precursor stem-loop, or find mature sequences that are related to your query).
E-value cutoff:
Maximum no. of hits:
Show results only from specific organisms: human mouse worm fly Arabidopsis
or choose a taxonomic classification: