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 TGCCAGATCCAAGCAACTTGGG CAAGTTTCTTGGGTCTGGAAGGA ATGCCTCTGCCAGATCCAAGCAACTTGGGTTAGGTGCCCCTTTCCAGCCCCAAGTTTCTTGGGTCTGGAAGGAGATGCGT 2 1 5' arm Populus_trichocarpa pmrd MIR474 0.0003 100 -38.3 ((((((((.(((((((((((.((((((((...((.........))...)))))))).)))))))))))..))))..)))) (-38.30)