the trp terminator ( trp t ) shares several features with other known sites of transcription termination , including ( i ) a 3'-terminal rna sequence of several uridine residues , c-a-u-u-u-u ( oh ) , ( ii ) a g.c-rich region in the dna immediately preceding the site of termination , followed by an a.t-rich region , and ( iii ) a region of dyad symmetry in the dna which , in the transcript , is capable of forming a stable hairpin containing seven g.c base pairs and one a.u base pair in its stem .
C0000702
a
C0012854
dna