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. Author manuscript; available in PMC: 2015 Jul 28.
Published in final edited form as: Nat Rev Genet. 2012 Apr 18;13(5):358–369. doi: 10.1038/nrg3198

Naming Convention Meaning Example(s)

3 letter prefix Species identification. This prefix is sometimes dropped in some journals, with the species under consideration mentioned in the adjoining text. hsa (human)
dme (fruit fly)

pri-mir or pre-mir (not lower case “r”) Used to indicate primary transcript of miRNA (pri-mir) or precursor form after Drosha processing (pri-mir) pri-mir-16, pre-mir-16

miR Mature miRNA hsa-miR-16

−3p or −5p Mature miRNA originating from the 3′ or 5′ end of the pre-miRNA, respectively hsa-miR-142-3p
hsa-miR-142-5p

a or b Closely related miRNAs that are related in sequence and evolutionary origin hsa-miR-20a
hsa-miR-20b

−1, or −2 Identical mature miRNA sequences that originate from different genomic loci hsa-miR-16-1
hsa-miR-16-2

miR* (star) ‘Passenger strand’ found at lower concentration, usually degraded (retired in miRBase 17) hsa-miR-9*