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 GGGTGCATTGCGGAGCGAGC CCGTTCCAACAATGTTCCG GGGTGCATTGCGGAGCGAGCTGAGATCGTACAGCCCGTTCCAACAATGTTCCG 4 1 5' arm Ciona_intestinalis mirbase 100 cin-mir-4018a 3e-24 -24.3 .((.((((((.((((((.((((........)))).))))))..)))))).)). (-24.30)