Heme biosynthesis enzyme presence in the endosymbiotic bacteria and the Kinetoplastida analyzed in this work.

Enzyme name abbreviations are as in Figure 1. 1: enzymes capable of performing the same enzymatic reaction step in the pathway. 2: the PPOX putatively identified in C. K. crithidii is of a different family from the ones identified in the Kinetoplastida (see text); 3: symbiont-harboring trypanosomatids; 4: regular trypanosomatids; 5: bodonid.