The miRBase release 22 reference files: stem-loop sequences (hairpins) and mature miRNA sequences

<pre>The miRBase Sequence Database -- Release 22 ------------------------------------------- The miRBase database provides a searchable online repository for published microRNA sequences and associated annotation. miRBase also provides a gene naming and nomenclature function in the miRBase Registry. Release 22 of the database contains 38589 entries representing hairpin precursor miRNAs, expressing 48885 mature miRNA products, in 271 species. The data are freely available to all through the web interface at http://www.mirbase.org/ and in flatfile form from ftp://mirbase.org/pub/mirbase/. </pre>