Figure 5.

The phylogenetic tree of the Signal peptidases I (SP1), inferred by the neighbor-joining method based on the amino acid sequences with Poisson corrected distance. The option of complete deletion of gaps was used for tree construction. 1000 bootstrap replicates were used to infer the reliability of branching points. Bootstrap values of >50% are presented. The scale bar indicates the number of amino acid substitutions per site. The putative P. falciparum calpain and P. yoelii yoelii ortholog are highlighted in red and blue, respectively. The SP1 homolog in Arabidopsis is termed Chloroplast thylakoidal processing peptidase. Imp is the abbreviation for mitochondrial inner membrane peptidase.