Model of the small putative group I intron secondary structure based on conserved structures. Exons are represented by black regions. Intron regions are in white. Dashed lines indicate regions connected within the intron. Conserved nucleotides are shown (although there are some G-C pairing differences in P7 in the introns from isolates NIH 8701 and NIH B1214). Grey area indicates P10. PM is the middle pairing region.