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 AAAATCGGCAGCGAGAACTGCG TGACAGTGTCGCTGTCGATTTAGA GGTTTGACAGTGTCGCTGTCGATTTAGAAATCAGCAGCCACAAACTGCGTCGCTGCCAATTCTAAAATCGGCAGCGAGAACTGCGCC 2 4 3' arm Populus_trichocarpa pmrd 100 100 -37.5 (((..(.((((.(((((((((((((((((....(((((.((.......)).)))))...)))).)))))))))))))..)))))))) (-37.50)