Figure 3. Comparison of group I intron insertion sites in the amino acid alignment (Clustal W) of the COX1 protein encoded by six long cox1 genes of fungi.

Introns are designated by their Pcl name (From A to Z and from AA to AI) and by their number in each fungal gene starting from the 5′ end of the gene. Closed and open symbols (triangles) indicate introns with intact and eroded heg, respectively. The insertion sites of the coral introns Pcls CO1 and CO2 never reported to date in the fungal kingdom are indicated by an arrow. The symbols “+1” and “+2” indicate that the insertion of the intron occurs inside the indicated codon: between the nt 1 and nt 2 of this codon for “+1” and between the nt 2 and nt 3 for “+2”.