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 CTCTTGAGAGCCATATAGAGGG TGCTATATGCTCTCGGGATTC GACCTGGTCTGTTCTCTTGAGAGCCATATAGAGGGATGAGTTAAGAAGCCTGCTATATGCTCTCGGGATTCCAGAACACGTC 2 1 5' arm Saccoglossus_kowalevskii mirbase 100 100 -31.22 (((.((.((((...((((((((((.((((((.(((.............))).))))))))))))))))...)))).)).))) (-31.22)