In apicomplexan parasites, Fis1 is the only mitochondrial fission protein identifiable via bioinformatics (9); BLAST searches of the malaria parasite genome database (www.PlasmoDB.org) did not find any homologs of other mitochondrial fission adaptor proteins in humans or yeast (Mff, MiD49, MiD51 or Mdv1/Caf4). This evidence concerns the gene FIS1 and malaria.