>Bko-Let-7_pre UGAGGUAGUUGGUUGUAUGGUUUAGAAUUGGAAACAAACUUGUUUUCGGACUAGGCAACCAAAGACUUUUCGAUAUGAUUUCGUUUAGUCUUCGGAUGAUCGAAUUAAAGUCAUUCCUAGUUCGGAACAAAACUCAAGCUAACCAUGCAACUUUCUAGCUUAAA