Small nucleolar RNA-derived microRNA
In molecular biology, small nucleolar RNA derived microRNAs are microRNAs (miRNA) derived from small nucleolar RNA (snoRNA). MicroRNAs are usually derived from precursors known as pre-miRNAs, these pre-miRNAs are recognised and cleaved from a pri-miRNA precursor by the Pasha and Drosha proteins.
Source: Wikipedia — Small nucleolar RNA-derived microRNA (CC BY-SA 4.0)