Fig. 8

Augmented compilation of the split cox2 arrangement and its subcellular localization through phylogeny. In the vast majority of eukaryotes, cox2 is intact and resides in the mtDNA. In wasps Campsomeris, cox2 is split into complementary cox2a and cox2b genes that reside in the mtDNA. In the chlorophycean algae Scenedesmus, Podohedriella, Neochloris, cox2 is also split, but cox2b had been transferred to the nucleus and lost from the mtDNA. In the chlorophycean algae Chlamydomonas, Polytomella, Volvox, Haematococcus, and in apicomplexan parasites, dinoflagellates, and Perkinsus, cox2 is split and both cox2a and cox2b have been relocated independently of one another to the nuclear genome and lost from the mtDNA