Fig 2. Predicted secondary structure of the complete 16S rRNA molecule for Scytonema hyalinum HTT-U-KK4.

Type 2 operon is the base structure, and variable bases in the Type 1 operon are shown as alternates. Indels are noted with empty circles where a base was deleted (or an insertion occurred opposite the position), e.g. in H6 and H10. The separation of the four domains are delineated with lines; the end of Domain 2 and beginning of Domain 3 occurs between helices 27 and 28.