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 TGAGGTAGTAGGTTATATCAGT TGTATAACCAACTAGCTTTCT CAAAGCCGCTCAAAATGAGGTAGTAGGTTATATCAGTTGAATATTTTACCATGGTGATAACTGTATAACCAACTAGCTTTCTTAAACGGTTTACTATCAGCA 3 1 5' arm Ciona_savignyi mirbase let-7 2e-36 cin-let-7c 0.000000005 -28.86 ..((((((........(((.((((.(((((((.((((((......((((....))))))))))))))))).)))).))).......)))))).......... (-28.86)