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 CGACGGAATATTTCCGTCGGTAA GCCGACGGACGTAATCCGTCGGT GGGAAAGCCGACGGACGTAATCCGTCGGTGAAGACATCGGTAAATAAATCACCGATGAAATGGTAATCACACACCGACGGAATATTTCCGTCGGTAAAACT 4 0 3' arm Populus_trichocarpa pmrd 100 100 -47.5 ......(((((((((.(((.((((((((((....(((((((.........))))))).....((....)).)))))))))).))).)))))))))...... (-47.50)