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 ATTGAGTGCAGCGTTGATGA ACCAGCGCTGCATTCAAT ATTGAGTGCAGCGTTGATGAAATCCTACATTTTGTGCTCTTAAACTGTTACCAACCCTTTATCCATGGCATCATTTCACCAGCGCTGCATTCAAT 1 0 5' arm Populus_tremula_x_Populus_tremuloides micropc MIR397 1e-31 ptc-MIR397a 3e-35 -31.1 ((((((((((((((((.((((((...(((.((((......)))).)))..(((............)))....)))))).)))))))))))))))) (-31.10)