Microprocessor cleavage of pri - miRNAs typically occurs co-transcriptionally .
Microprocessor cleavage of pri - miRNAs typically leaves a characteristic RNase III single - stranded overhang of 2 - 3 nucleotides , which serves as a recognition element for the transport protein exportin - 5 .
Microprocessor cleavage of pri - miRNAs typically occurs co-transcriptionally and leaves a characteristic RNase III single - stranded overhang of 2 - 3 nucleotides , which serves as a recognition element for the transport protein exportin - 5 .