microRNA

initialism: miRNA
https://doi.org/10.1351/goldbook.12682
Small single-stranded RNA molecules that play a significant role in the post-transcriptional regulation of gene expression.
Note: MicroRNA usually comprises approximately 22 nucleotides.
Source:
PAC, 2013, 85, 1725. (Glossary of terms used in medicinal chemistry. Part II (IUPAC Recommendations 2013)) on page 1741 [Terms] [Paper]