Positions of group I introns in the secondary structure of SSU rDNA

Group I introns in SSU rDNA This SSU rDNA secondary structure, including the sequence of the lichen-forming ascomycete Lecanora dispersa, shows the known places of group I intron occurence. The boxed numbers are a nomenclature we developed to name intron's positions relative to the secondary structure of E. coli. This figure is adapted from: Gargas, A., P.T. DePriest & J. W. Taylor (1995) Positions of multiple insertions in SSU rDNA of lichen-forming fungi. Mol. Biol. Evol. 12: 208-218.