Fig. 1From: The distribution, diversity, and importance of 16S rRNA gene introns in the order ThermoprotealesPosition of introns identified in 16S rRNA genes within the Archaea. Vertical arrows indicate loci with positions underlined (E. coli 16S rRNA numbering). Horizontal arrows indicate “universal” archaeal primers interrupted by the presence of intron sequences (arrows not to scale)Back to article page