mature_miRNA miRNA* pre-miRNA EST_contig mismatches bulges arm species source_database RFAM_best_hit RFAM_lowest_evalue miRBase_best_hit miRBase_lowest_evalue folding_energy secondary_structure AACTATACAACCTACTACCTCA AGGTAACGGGTTGTACAGTCAT GTATGACCCAAAAAAAGGTAACGGGTTGTACAGTCATCTCCAATGTTGTACTTCTGAACTATACAACCTACTACCTCACCTC 6 0 3' arm Branchiostoma_floridae mirbase let-7 1e-30 bfl-let-7a-1 8e-32 -16.77 ...............(((((..((((((((.(((((..................)).))).))))))))..)))))...... (-16.77)