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 TTCTCAGAGTGTGCTTCTTC AGAAGCAACCTCTGGAAGC ATGTAAGATTCTCAGAGTGTGCTTCTTCTGCAGGCATAGCTACTTCTTGAAGATGGCAAGCGAGGCTGGAGAAGCAACCTCTGGAAGCAT 2 1 5' arm Populus_trichocarpa pmrd 100 100 -33.8 ......(.(((.(((((..(((((((((.((..((...(((((((....))).))))..))...)).)))))))))..)))))))).).. (-33.80)