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 TGAGGTAGGAGGTTGTATAGTT CTATACGGCCTCCTAGCTTTCC CGCGCCCCCCGGGCTGAGGTAGGAGGTTGTATAGTTGAGGAAGACACCCGAGGAGATCACTATACGGCCTCCTAGCTTTCCCCAGGCTGCGCC 3 0 5' arm Rattus_norvegicus mirbase let-7 1e-34 mmu-let-7e 7e-48 -45.9 .((((..((.(((..(((.((((((((((((((((.((......(......)....)))))))))))))))))).)))..))).))..)))). (-45.90)