Figure 2

Distribution of introns in Chlorokybus and other streptophyte mtDNAs. Circles denote the presence of group I introns and squares denote the presence of group II introns. Divided squares represent trans-spliced group II introns. Open symbols denote the absence of intron ORFs, whereas filled symbols denote their presence. Intron insertion sites in genes coding for tRNAs and proteins are given relative to the corresponding genes in Reclinomonas americana mtDNA; insertion sites in rns and rnl are given relative to Escherichia coli 16S and 23S rRNAs, respectively. For each insertion site, the position corresponding to the nucleotide immediately preceding the intron is reported.