Secondary structures of csRNAs from S. thermophilus plasmid pSt0, S. thermophilus CNRZ1066, and S. mitis SF100. The csRNA gene predictions from Table 2 were folded using the Mfold program . Sequences complementary to Shine-Dalgarno  sequences or translation initiation codons are underlined and shown in red. A conserved stretch of nucleotides found in virtually all csRNAs is underlined and shown in blue. S. thermophilus csRNA are not expressed in their native hosts due to ciaR inactivation.