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 CAGTACAATCTACTGTCTTGCC GCGTGGGATGAGGTAGTAGGTTGTATAGTTTGGGGAGTGTGACCCCGTTCAGGAGATAACAGTACAATCTACTGTCTTGCCCAAGC 3 0 5' arm Petromyzon_marinus mirbase let-7 0.00000002 gga-let-7a-1 0.000000001 -36.1 ((.((((.((((..((((((((((((.((((((((.......)))))..........))).))))))))))))..)))))))).)) (-36.10)