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 CTGCCGATTCAGAGATCGGCAGC TGCCAATTCTGAAATCGGCAATG GTCGCTGCCGATTCAGAGATCGGCAGCCACAAACTGCGTCGCTGCCAATTCTGAAATCGGCAATGAT 3 2 5' arm Populus_trichocarpa pmrd 100 100 -32.4 ((((.(((((((((((((...((((((.((.......)).))))))..))))).)))))))).)))) (-32.40)