Secondary structures of csRNAs from S. mitis B6, S . oralis Uo5, and S. sanguinis SK36. 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. These csRNAs were verified by northern blot analysis (Figure 6).