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 TGAGGTAGTAGATTGTATAGTT CTATACAGTCTACTGTCTTTCC TGTGGGATGAGGTAGTAGATTGTATAGTTTTAGGGTCATACCCCATCTTGGAGATAACTATACAGTCTACTGTCTTTCCCACG 3 0 5' arm Rattus_norvegicus mirbase let-7 3e-35 mml-let-7f-2 6e-42 -40.7 .((((((.(((..((((((((((((((((...(((.....))).(((.....)))))))))))))))))))..))))))))). (-40.70)