Fig. 4From: Discovery of 20 novel ribosomal leader candidates in bacteria and archaeaS4, S6:S18 and L13 r-leader motifs. (All 20 motifs are shown in Additional file 1: Figures S2-S11). Annotations are as in Fig. 2. a S4 motifs that do not appear to imitate the rRNA. b S6:S18 motif in Chlorobi. c L13 in BacteroidetesBack to article page