The mature sequence is excised from the 5' arm of the hairpin. Two other miRNA precursors were found in this reading frame, namely Mir-BHRF1-1 and Mir-BHRF1-2.
The final stage of miRNA development involves removing a segment from the 5' end of the hairpin structure. Additionally, two other miRNA precursors, Mir-BHRF1-1 and Mir-BHRF1-2, are found in this sequence.