Brief information on intron Pcl Ple.18S1. A Taxonomic distribution of Nta.18SS453 and similar introns (dataset onlyintron_465); B taxonomic distribution of Nta.18SS453 and 287 references with alignment scores higher than 200; C the maximum number of positional nucleotides in the alignment of 229 sequences (dataset nointron_229), indicating conservation at each nucleotide. The consensus sequence at both flanks of the insertion is shown at the top; D PCoA plot showing dissimilarities in the alignment of 465 intron sequences (dataset onlyintron_465).