Figure 6

Perforin genes have acquired introns in multiple lineages. The coding sequences (CDS) of perforin genes are drawn as black lines to the scale shown. Positions of introns are indicated by red ‘V’ shapes, with the intron phasing numbered at the left of the markers. Conserved introns are linked with dotted vertical lines. Introns in the 5’ untranslated region (UTR) are not shown as they require EST evidence and therefore cannot be traced consistently.