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 CATGGCACTGCTGAAGGTTCG GACTTTCAACAGGCCATACA GCTTCGGACTTTCAACAGGCCATACACCTCGTGTGATGCATGGCACTGCTGAAGGTTCGAAAGC 2 1 3' arm Pristionchus_pacificus mirbase 100 ppc-mir-2253b 1e-17 -29.5 ((((((((((((((.((((((((.((.(......).)).))))).))).)))))))))).)))) (-29.50)