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 TGAGGTAGTAGGTTGTATAGTT CTATGCAATTTTCTACCTTACC TACACTGTGGATCCGGTGAGGTAGTAGGTTGTATAGTTTGGAATATTACCACCGGTGAACTATGCAATTTTCTACCTTACCGGAGACAGAACTCTTCGA 1 0 5' arm Caenorhabditis_elegans mirbase let-7 1e-34 cbr-let-7 4e-19 -42.9 ....((((...(((((((((((((.((((((((((((((((..........))...)))))))))))))).))))))))))))).)))).......... (-42.90)