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. 2002 Mar;68(3):1180–1191. doi: 10.1128/AEM.68.3.1180-1191.2002

FIG. 3.

FIG. 3.

Predicted secondary structures of the 16S-23S rRNA ITS in three high-B/A Prochlorococcus strains and six Synechococcus strains identified in this study. (A) Prochlorococcus strain NATL2A, (B) Prochlorococcus strain SS120, (C) Prochlorococcus strain MIT 9211, (D) marine cluster A Synechococcus strain WH 6501, (E) marine cluster A Synechococcus strain WH 8020, (F) marine cluster A Synechococcus strain WH 7803, (G) marine cluster B Synechococcus strain WH 8101, (H) marine cluster B Synechococcus strain WH 5701, and (I) Cyanobium cluster Synechococcus sp. strain PCC 6307. Locations of the 16S rRNA, 23S rRNA, and 5S rRNA are represented by triangles. All strains have an antiterminator box B loop and box A sequence conserved in most bacterial ITS sequences as well as genes for tRNAs isoleucine and alanine typical of cyanobacterial ITS sequences. Sequence corresponding to the box A motif is enclosed in a rectangle. The 5′ region of the tRNAAla-23S rRNA spacer (between the tRNAAla and the box B loop) for which no structure was inferred is shown in three rows of text to save space.