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 TGACAGAAGAGAGAGAGCAC GCTCCACTACTT TGACAGAAGAGAGAGAGCACAATCCGAGTCTTGTATTTGTGTTAACCTGTCACAGAACATTCTATGGCTACTTGCTCCACTACTT 8 2 5' arm Populus_tremuloides pmrd mir-156 0.0003 ahy-MIR156c 0.000001 -16.6 ......(((((.(.(((((....(((((...(((.((((((.........)))))))))..)).))).....)))))).)).))) (-16.60)