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 CAAAGTGCTCATAGTGCAGGTAG ACTGTAATATGGGCACTTACAG GCAGTTCCAAAGTGCTCATAGTGCAGGTAGTTGTATTCATGTTCTACTGTAATATGGGCACTTACAGTACTGCT 3 1 5' arm Xenopus_laevis mirbase mir-17 0.00000000000007 xtr-mir-20b 3e-34 -29.4 (((((....(((((((((((.(((((.(((.((....))....)))))))).))))))))))).....))))). (-29.40)