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 CTGTACAACCCGTTACCTTTTT CTGAGGTGAGGTAGTAGGTTGTATAGTTCAGAAGTACAACATTGGAGATGACTGTACAACCCGTTACCTTTTTTTGGGTCAT 4 0 5' arm Branchiostoma_floridae mirbase let-7 9e-32 bfl-let-7b 8e-32 -29.7 (..(((.(((((((..(((((((((((.((......((....))....)))))))))))))..))))))).)))..)..... (-29.70)